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Index Column

Index

3 Phase Power

7-Segment Code
7-segment display - ladder logic

74XXX TTL Data Sheets

A


abampere

abbreviations:
     Electrical Engineering Abbreviations and Acronyms
     Military Abbreviations and Acronyms

ABCD matrices for transmission lines

Absolute Pressure

Absolute Viscosity

absorption spectra

acids - pH of common inorganic acids

activity series of metals

adder:
     full-adder
     half-adder

air composition

Air Pressure Loss For Every 100 Feet of Clean Commercial Steel Pipe

American National Standard Letter Designation for Welding and Allied Processes (ANSI/AWS A2.4-9I)

American Standard Code for Information Interchange (ASCII)

American Wire Gauge (AWG)

Ampacity of Copper and Aluminum Insulated Wire

ampere

Ampere's Circuital Law

amplifier - General purpose Amplifier

amplifier - general purpose inverting amplifier

angle between two vectors

Angular Speed Formula

Angular Velocity Formula

apparent power

area of two dimensional shapes

area unit conversion calculator

Atmospheric Pressure at Altitudes Above Sea Level

AutoCAD Notes

AutoDesk AutoCAD Notes

automation

AWG (American Wire Gage)



battery technology

beam:
     structural beams

Beam Deflection

Beam Design and Analysis for Moment and Shear

Belt:
     V-belt:
          Commercially available "5V" Sheave Pitch Diameter
          dimensions
          sizing chart
          Belt Reduced Power Capability with Contact Angle

Bernoulli's Law

bevel gear

Blot-Savart Law for Magnetic Field & Lorentz Force Equation

Bleeder Valve

blinking lamp circuit - ladder logic

bolt: Eccentrically Loaded Bolts

bolt and nut materials

bolt technical reference guide

Boltzmann constant

Bonding between atoms and molecules

boolean algebra summary

Boundary Conditions

Boyle's Law

BSPT (British Standard Pipe Thread)

BSPP (British Standard Parallel Pipe)

Bulk Modulus of Common Substances

Buoyancy Force

 

camera: contact lens camera

camera: vision system cameras

Capacitance, Conductance, and Inductance

Capacitor

capacitor energy storage

Cartesian Coordinate System

Cartesian, Cylindrical, Spherical Conversions

centroids of two dimensional shapes

Ceramics

chain pitch selection chart for roller chains

chain sprocket and platewheels

Charge Distributions

charge of an electron

charge of a proton

Charles's Law

Chebyshev Frequency Response for n=4

Check Valve

circle

circuit breaker

circuit components

co-function identities

codes:
     2 out of 5 code
     7-Segment Code
     ASCII
     Gray Codes

Coefficients of Friction

Coefficients of Linear Thermal Expansion

Column Design and Analysis

Combined Stresses, Axial, Bending, Shear: Mohr's Circle

comparator

Comparison of Properties of Straight Tungsten Carbides and Tool Steels

complex trigonometric identities

complex numbers

Complex Numbers and Phasor Techniques

compressor

Compton scattering

connectors

connectors - modular connectors

Connections: Bolted and Welded

contact configurations

contact lens camera

contactor

Continuity Equation in Fluid Mechanics

Continuity Equation in Electromagnetism

conversions (number base):
     binary to decimal conversion
     binary to hexadecimal conversion
     binary to octal conversion
     decimal to binary conversion
     decimal to hexadecimal conversion
     decimal to octal conversion
     hexadecimal to binary conversion
     hexadecimal to decimal conversion
     octal to binary conversion
     octal to decimal conversion

conversions between two-port network parameters

Coordinate Systems in Electromagnetism

copper tubing
     dimensions of type K copper tubing

Coulomb's Law

CREO Parametric

cross product

Crystal structures for common metals at room temperature

curl operator

cylinder (pneumatic or hydraulic)

Cylindrical Coordinate System

Cylindrical, Spherical, Cartesian Conversions


D Latch

Dalton's Law of partial pressure

Darcy's Formula

data sheets

DC and AC Circuits

de Broglie Theorem

decibel dB

Decimal Equivalent Chart

decoder - ladder logic

Deflection in Beams

demultiplexer

density unit conversion calculator

dielectric constants of selected materials

dielectric strengths of selected materials

Dielectrics as related to Displacement Flux Density

differential operators

Differential Unit Vector in Cartesian Coordinate System

Differential Unit Vector in Cylindrical Coordinate System

Differential Unit Vector in Spherical Coordinate System

Dimensions of Steel Pipe

Dimensions of Steel Valve and Steel Fittings

diode

diode - Light Emitting Diode (LED)

diode - Schmitt Trigger

diode: Voltage drop across a diode

Directional Valve

distance between point and line

distance between point and plane

Divergence

divergence operator

Divergence Theorem

double angle formulas

dot product

drill bit size conversions

Ductility of Selected Materials Measured as Percent Elongation

earth

Eccentrically Loaded Bolts

efficiency

elastic modulus for selected materials

elastomer: Hardness Scale comparison table of metals and elastomer

electric charge

electric current

Electric Field Intensity

Electric Stored Energy Density

Electrical Metallic Tubing - EMT Sizes, Weights, and Dimensions

Electromagnetic Spectrum

Elements of the Periodic Table

EMT Conduit Sizes, Weights, and Dimensions

encoder

energy storage in a capacitor

Energy Storage in Electric and Magnetic Fields

energy unit conversion calculator

equation of a plane

equations

Euler identity

even-odd identities

Exclusive OR (XOR) vs Exclusive NOR (XNOR)

expansion for hyperbolic functions

expansion for sine, cosine, tangent, cotangent

fans as applied to electrical enclosures

Faraday's Law

Faraday's Law and Ampere's Circuital Law in differential Form

fastener: Thread Series Designation

fastener technical reference guide

FDA:

21 CFR 211 - CURRENT GOOD MANUFACTURING PRACTICE FOR FINISHED PHARMACEUTICALS

FlexiBowl

flip-flop using Omron KEEP instruction

Flow Curve and Typical Values of Strength Coefficient K and Strain Hardening Exponent n for Selected Materials

Flow of Air Through Schedule 40 Steel Pipe

Flow of Water Through Schedule 40 Steel Pipe

Fluid Sealing Material Compatibility Chart

force unit conversion calculator

fractions to decimal conversion table

Frequency Allocation Chart in the US (pdf)

full-adder - ladder logic

Gauss' Law

Gauss' Law derived from Conservation of Charge and Ampere's Law

GD&T (Geometric Dimensioning and Tolerancing)

gear:
     bevel gear
     Gear Types

General Energy Equation (Fluid Mechanics)

Geneva drive

geometric tolerancing

Geometry

golden ratio

golden rectangle

Gradient in Cartesian, Cylindrical and Spherical Coordinates

gradient operator

Gray Code:
     Gray Codes
     how to generate gray codes

Greek alphabet

grippers

parallel grippers

needle grippers (overview)

H Beams & Wide Flange ASTM-A36/A572

H-Bridge

Hagen Poiseuille Law for Laminar Flow

half angle formulas

half-adder - ladder logic

Hamming Codes

Hand Pump System

Hardness Scale comparison table of metals and elastometers

Hazen-Williams Constants for Various Materials

head, Velocity

hexagon

HMI (Human Machine Interface)

hydraulic Horsepower

hydraulic Radius

hydraulic schematic symbols

hyperbolic functions

I Beams ASTM-A36/A572

identities:
     co-function identities
     complex trigonometric identities
     euler identity
     even-odd identities
     Pythagorean identities
     quotient identities
     reciprocal identities
     trigonometric identities
     vector identities

image parameters for T and pi networks

inductor

Inequalities

Infrared Spectrum

insulation: Relationship between an Insulator's K-factor, C-factor, and R-factor

integral tables

intensity of a sound wave

interlock circuit in Ladder Logic

Internal Fluid Pressure (psi) on Tubing

inverter

JK Flip Flop

Junior Beams ASTM-A36

Jupiter

kinematic equations

Kinematic Viscosity

Kirchhoff's Current Law

Ladder Logic Circuits

laminar flow: Hagen Poiseuille Law for Laminar Flow

Laplace Transforms

Laplace's Equation

Laplacian operators

Laplacian of a Scalar Function and a Vector

Latches

Law of Conservation of Charge

Law of cosines

length unit conversion calculator

Lens Types

Lenz's Law

Light Emitting Diode (LED)

Limits - Calculus

List of Natural Elements of the Periodic Table

logarithmic constant

logic functions - ladder logic

logic gates

Lorentz Force Equation

low-pass RC filter

Magnetic Field--Ampere's Law, Biot-Savart Law

Magnetic Field Intensity

Magnetic Flux Density

magnetic force on a moving charge

Magnetic Stored Energy Density

Magnetic Vector Potential

mass/weight unit conversion calculator

mathematical symbols

matrices

Maxwell's equations

mechanical power

Mechanics

mechanisms

Melting Points for Some Common Metals and Alloys

mesh sizes: Strainer Mesh Sizes and Size of Solids Removed When Strainer is Clean

Metals

metals: Hardness Scale comparison table of metals and elastometers

Mesh Size Chart

Microwave Oven (pdf)

millimeters to decimal conversion table

modular connectors

Modulus of elasticity for selected materials

modulus of rigidity

moment of inertia

moment of inertia transfer formula

momentum

Moody Friction Factor Chart

MOSFET:
     N-Channel MOSFET

Motion Control Using Servo and Stepper Motors

Motorola microcontrollers

motors:
     electric motor family tree
     classification of Motors by application
     NEMA classification of Motors
     PWM - pulse width modulation
     Sizing a Motor for Hydraulic Pump
     Standard Electric Motor Sizes
     DC Motor - Compound Wound

multiplexer

Multiplication Table (1 thru 12)

 

NAND (Diode-Transistor Logic)

needle grippers (overview)

NEMA Enclosure Ratings

NEMA Motor Frame Sizes

Neutralization Number

Newton's laws of motion

network functions: Types of Network Functions

NOR (Diode-Transistor Logic)

NPN Transistor

NPT (National Pipe Thread)

NPS (Nominal Pipe Size) - Straight pipe sizes

nut:
     bolt and nut materials

Ohm's Law

OSHA - Safeguarding Equipment and Protecting Employees from Amputations

PanelView: How to connect to PC

parameters:
     image parameters for T and pi networks

Pascal's Law

Permeability of a vacuum (or free space)

pi networks: image parameters for T and pi networks

pipe: dimensions and properties of schedule 40 and 80

Pipe Fitting Dimensions

pipe thread types

periodic table: List of Natural Elements of the Periodic Table

PLA

Plank's Law

plastics

PLC (Programmable Logic Controller)

PNP transistor

Poisson's Equation

Poisson's ratio

polar moment of inertia

Polarization

polygon

polymers

Potential Function for Static and Non Static Fields

power consumed by a resistor

Power developed by the product of the force and velocity

power definition

power - Mechanical Power

power-reducing/half angle formulas

power series representation

power:
     electrical apparent power

power transmitted by a shaft given a torque and speed of a shaft

power unit conversion calculator

powers of two

pressure (psi) conversion factors

Principle of Reciprocity

pressure: Atmospheric Pressure at Altitudes Above Sea Level

pressure: Internal Fluid Pressure (psi) on Tubing

product-to-sum formulas

proximity sensor - inductive

PTC CREO Parametric Notes

pump system: Hand Pump System

PWM (pulse width modulation)

Pythagoras' Theorem

Pythagorean identities

Pythagorean Triples

 

quadratic formula and proof

quotient identities

radius of gyration

range equation

radian measure

RC Time Delay

reciprocal identities

regeneration circuit

Relationship between Shear stress and Tensile stress

relay

relief valve

resistivity

Reynold's Equation

robots - Types of Industrial Robots

Rockwell Hardness Scales

ROM (Read Only Memory)

rubbers

safety - machine safety

safety - standards for machine safety

Sanitary Fittings - Tri-Clamp

Saybolt Universal Viscosity

scalar product of two vectors

Schedule 40 pipe: Working Pressure In PSI (psi) in Standard Pipe, Extra Heavy Pipe, Double Extra Heavy Pipe

Schmitt Trigger Diode

Schrödinger's equation

Scissor Lift Mechanism

screw materials

screw tapping and clearance chart

screw thread pitch

screw thread series designations

screw thread types

seals: Fluid Sealing Material Compatibility Chart

sensors

seal in contact in Ladder Logic

Shear and Moment Diagrams by the Summation of Areas

shear strain

Shear Strength of Materials

shear stress analysis on a bolt in single shear

shear stress: Relationship between Shear stress and Tensile stress

sheetmetal gauge sizes and weight/ft^2

SI prefixes

Sieve Opening Size Chart

Sizing a Motor Horsepower (HP) for Drilling, Tapping, and Threading

Sizing a Motor horsepower (HP) for Hydraulic Pumps

Sizing a motors horsepower (Hp) and torque for turning a solid round disk

Skin Depth of Copper

Slider-Crank connecting rod angular speed and acceleration

software notes

solar system

spacecrafts

spark plug

Specific Gravity

specific gravity of gases

specific gravity of liquids

Specific Roughness and Hazen-Williams Constants for Various Materials

Specific Weight

Spectrum: Electromagnetic Spectrum

Spectrum: Infrared Spectrum

speed of sound

speed unit conversion calculator

Spherical Coordinate System

Spherical, Cylindrical, Cartesian Conversions

sprockets and platewheel types

SR Latch

SR Master-Slave Flip-Flop

Stainless Steel Chemical Composition

Standard Electric Motor Sizes

standards for machine safety

Stefan-Boltzmann Law

Stepper Motor Wiring Diagrams

Stokes' Theorem

straight pipe sizes - NPS

strain hardening exponent: Flow Curve and Typical Values of Strength Coefficient K and Strain Hardening Exponent n for Selected Materials

Strainer Mesh Sizes and Size of Solids Removed When Strainer is Clean

strength coefficient: Flow Curve and Typical Values of Strength Coefficient K and Strain Hardening Exponent n for Selected Materials

Strength of Materials

Stress-Strain Curves (pdf)

Stress Summary

Stresses in Beams and Built up Sections and Bolt Spacing

Structural Members

summing junction amplifier

sum or difference of two angles

sum-to-product formulas

sun

sun spot

symbols - electrical symbols

symbols - mathematical symbols

synchronous belt

T networks:
     image parameters for T and pi networks

Tangent Line Problem

tap drill reference

temperature unit conversion calculator

tensile strength: Yield Strength and Tensile Strength for Selected Metals

thermal conductivities of various media

thermal expansion

thermal expansion: Coefficients of Linear Thermal Expansion

Thread Series Designations

thread types - screw

thread types: pipe thread types

time delay - RC Time Delay

timing belt

toggle output with a single pushbutton - ladder logic

toggle output using single pushbutton with different TON and TOFF delays - Ladder Logic

Tonnage for Hole Punching

tool steel:
     Comparison of Properties of Straight Tungsten Carbides and Tool Steels

tool steels

Torricelli's Theorem

Torque Couplings

torque unit conversion calculator

torsion

torsional deflection of a shaft

transformer

transistor - NPN

transistor - PNP

Transmission Line - Parallel Plate

transmission line table of equations(pdf)

Transmission Line Terminated by Resistive Load

Transmission Line with Discontinuity

Tri-Clamp Sanitary Fittings

triangle

trigonometric functions

trigonometric identities

trigonometric values for common angles

Triple Scalar Product

tubing: Dimensions of Type K Copper Tubing

tungsten carbide:
     Comparison of Properties of Straight Tungsten Carbides and Tool Steels

Two-Phase Alternating Current

Two-Port Network Conversions

Types of Network Functions

unit circle

Unit Vectors: Cylindrical & Cartesian, Spherical & Cartesian

USB - Universal Serial Bus

V-belt: Commercially available "5V" Sheave Pitch Diameter V-Belts

V-belt dimensions

V-belt sizing chart

V-Belt Reduced Power Capability with Contact Angle

valve: Bleeder Valve
valve: Check Valve
valve: Directional Valve
valve: Relief Valve

vector:
     angle between two vectors
     vector cross product
     scalar product of two vectors
     vector identities

viscosity

viscosity Index

vision cameras

vision systems

voltage

voltage - worldwide voltages

voltage divider

Voltage drop across a diode

voltage follower

voltage peak detector

voltage regulator

volume unit conversion calculator

wedge physics

weight/mass unit conversion calculator

Welding Filler Metals For Various Aluminum Alloys

welding processes

welding symbol: Location of Elements of a Welding Symbol

Wide Flange & H Beams ASTM-A36/A572

Wien's Law

Wire:
     American Wire Gauge (AWG)
     Ampacity of Copper and Aluminum Insulated Wire

Working Pressure In PSI (psi) in Standard Pipe, Extra Heavy Pipe, Double Extra Heavy Pipe

worldwide voltages

Exclusive OR (XOR) vs Exclusive NOR (XNOR)

Yield Strength and Tensile Strength for Selected Metals

Young's modulus of elasticity


 
  Military Abbreviations and Acronyms
 

Military Abbreviations and Acronyms

 

 

               a           Acceleration or atto (10-18 multiplier)
               A           Ampere, Area, Altitude, Angstrom (), Antenna Aperture, or Aerial (U.K.)
               A-799       No evidence of failure report
               A/A, A-A, AA  Air-to-Air or Anti-Aircraft
               AA-()       Air-to-Air missile number ()
               AAA         Anti-Aircraft Artillery
               AAAA        Army Aviation Association of America
               AAED        Advanced Airborne Expendable Decoy
               AAM         Air-to-Air Missile
               AARGM       Advanced Anti-Radiation Guided Missile (concept)
               AAW         Anti-Air Warfare
               A-BIT       Automatic Built-in-Test
               ABM         Air Breathing Missile or Anti-ballistic Missile
               A/C         Aircraft (also acft.)
               AC          Alternating Current
               ACA         Associate Contractor Agreement or Airspace Coordination Area
               ACAT        Acquisition Category
               ACCB        Aircraft Configuration Control Board
               Acft        Aircraft (also A/C)
               ACLS        Aircraft Carrier Landing System
               ACM         Advanced Cruise Missile or Air Combat Maneuvering
               ACQ         Acquisition
               ACS         Antenna Coupler Set
               ACTD        Advanced Concept Technology Demonstration
               A/D         Analog to Digital
               Ada         Not an acronym.  Ada is the DoD standard programming language.
               ADM         Advanced Development Model
               ADP         Automatic Data Processing or Advanced Development Program
               ADVCAP      Advanced Capability
               AEC         Aviation Electronic Combat (Army)
               AEGIS       Automatic Electronic Guided Intercept System
               AEL         Accessible Emission Limit
               AEW         Airborne Early Warning
               AF          Antenna Factor, Air Force, or Audio Frequency
               AFB         Air Force Base or Airframe Bulletin
               AFC         Automatic Frequency Control or Airframe Change
               AFIPS       Automated Financial Information Processing System
               AFOTEC      Air Force Operational T&E Center
               A/G         Air-to-Ground
               AGB         Autonomous Guided Bomb
               AGC         Automatic Gain Control
               AGI         Auxiliary General Intelligence (Intelligence-gathering Ship)
               AGL         Above Ground Level
               AGM         Air-to-Ground Missile
               AGS         Angle Gate Stealer
               AHWS        Advanced Helicopter Weapons System
               AI          Artificial Intelligence, Air Intercept, or Airborne Interceptor
               AIAA        American Institute of Aeronautics and Astronautics
               AIC         Air Intercept Control
               AIM         Air Intercept Missile
               AIRLANT     Commander, U.S. Naval Air Forces, Atlantic Fleet
               AIRPAC      Commander, U.S. Naval Air Forces, Pacific Fleet
               AJ          Anti-jamming or Anti-Jam
               A-Kit       Aircraft wiring kit for a system (includes cabling, racks, etc.
               excluding WRAs)
               AM          Amplitude Modulation
               AMD         Aircraft Maintenance Department
               AMES        Advanced Multiple Environment Simulator
               AMLV        Advanced Memory Loader/Verifier
               Amp         Amplifier
               AMRAAM      Advanced, Medium-Range, Air-to-Air Missile
               ANSI        American National Standards Institute
               ANT         Antenna
               Ao          Operational Availability
               AO          Acousto-Optical
               AOA         Angle of Arrival, Angle of Attack, or Analysis of Alternatives
               (similar to COEA)
               AOC         Association of Old Crows (Professional EW Society) or Award of Contract
               AOT         Angle Only Track, Angle Off Tail, or Acquisition-on-Target
               APC         Amphenol Precision Connector or Armored Personnel Carrier
               APN         Aircraft Procurement, Navy
               APO         Armed Forces Post Office, Army Post Office, Air Post Office, or
               Acquisition Program Office
               APU         Auxiliary Power Unit
               AR          Anti-reflection or Aspect Ratio
               ARM         Anti-radiation Missile
               ARO         After Receipt of Order
               A/S, A-S, AS  Air-to-Surface
               ASCM        Anti-ship Cruise Missile
               ASE         Aircraft Survivability (or Survival) Equipment, Allowable Steering
               Error, or Automatic Support Equipment
               ASIC        Application Specific Integrated Circuit
               ASK         Amplitude Shift Keying
               ASM         Air-to-Surface Missile
               ASO         Aviation Supply Office
               A-Spec      System Specification
               ASPJ        Airborne Self-Protection Jammer
               ASPO        Avionics Support (also Systems) Project Office (also Officer)
               ASR         Advanced Special Receiver or Airport/Airborne Surveillance Radar
               ASRAAM      Advanced Short Range Air-to-Air Missile
               ASTE        Advanced Strategic and Tactical Expendables
               ASW         Anti-submarine Warfare
               ATA         Advanced Tactical Aircraft
               ATARS       Advanced Tactical Air Reconnaissance System
               ATC         Air Traffic Control
               ATD         Advanced Technology Demonstration
               ATE         Automatic Test Equipment
               ATEDS       Advanced Technology Expendables and Dispenser Systems
               ATF         Advanced Tactical Fighter
               ATIMS       Airborne Turret Infrared Measurement System or Airborne Tactical
               Information Management System
               ATIRCM      Advanced Threat Infrared Countermeasures
               ATP         Acceptance Test Procedure
               ATR         Autonomous Target Recognition, Airborne Transportable Rack
               ATRJ        Advanced Threat Radar Jammer
               AUTODIN     Automatic Digital Network
               AUTOVON     Automatic Voice Network (now DSN)
               AUX         Auxiliary
               avdp.       Avoirdupois (system of measures)
               Avg         Average
               AWACS       Airborne Warning and Control System
               AZ          Azimuth (also Az)B           Bandwidth (also BW) or Magnetic inductance
               BAFO        Best and Final Offer
               BATBULL     Bat Bulletin - former VX-9 tactics newsletter, now called "On Target"
               BAU         Bus Adapter Unit
               BC          Bus Controller
               BDA         Battle Damage Assessment
               BDI         Battle Damage Indication
               BFO         Beat Frequency Oscillator
               BI          Background Investigation
               BIFF        Battlefield Identification, Friend, or Foe
               BIT         Built-in-Test, Binary Digit (the smallest unit of information
               in a binary system), or Battlefield Information Technology
               BITE        Built-in-Test Equipment
               BIU         Bus Interface Unit
               B-Kit       The "Black Boxes" (WRAs) which compose a particular avionics system
               B/N         Bombardier/Navigator
               BNC         Bayonet Navy Connector
               BOA         Basic Ordering Agreement
               BOL         Swedish acronym for a chaff dispenser in a launcher
               BPF         Band Pass Filter
               BPS         Bits Per Second
               BUMED       Bureau of Medicine (Navy)
               BUNO        Bureau Number (aircraft)
               BUR         Bottom Up Review
               BVR         Beyond Visual Range
               BW          Beamwidth (referring to an antenna) or sometimes Bandwidth (also B,
               referring to a receiver)
               BWA         Backward Wave Amplifier
               BWO         Backward Wave Oscillator
               c           Speed of Light = 3x108 meters/sec =
               1.8x1012 furlongs per fortnight or
               1.8 terafurlongs per fortnight, or centi (10-2) multiplier
               C           Electron Charge, Coulomb, Capacitance, Celsius, Centigrade, Confidential,
               Roman numeral for 100, or a programming language (also C+ and C++)
               C2          Command and Control
               C3          Command, Control, and Communications
               C3CM        C3-Countermeasures
               C3I         Command, Control, Communications, and Intelligence
               CAD         Computer-Aided Design
               CAE         Computer-Aided Engineering
               CAG         Carrier Air Group
               CAGE        Commercial and Government Entry
               CAIV        Cost as an Independent Variable
               CAL         Calibration
               CAM         Computer-Aided Manufacturing or Constant Addressable Memory
               CAO         Competency Aligned Organization or Contract Administrative Officer
               CAP         Combat Air Patrol
               CAS         Close Air Support or Calibrated Airspeed
               CASS        Consolidated Automated Support System
               CAT         Catapult or Cockpit Automation Technology
               CB          Citizens Band (also see Seabee)
               CBD         Commerce Business Daily
               CBIT        Continuous Built-in-Test
               CBO         Congressional Budget Office
               CCA         Circuit Card Assembly
               CCB         Configuration Control Board
               CCD         Charge Coupled Device
               CCM         Counter-Countermeasures
               CCN         Contract Change Number or Configuration Change Notice
               CCU         Cockpit Control Unit
               cd          Candela (SI unit of luminous intensity)
               CD          Compact Disk or Control and Display
               CDC         Combat Direction Center
               CDR         Critical Design Review
               CDRL        Contract Data Requirements List
               CE          Conducted Emission
               CECOM       Communications and Electronics Command (Army)
               CEP         Circular Error Probability
               CFA         Cognizant Field Activity
               CFAR        Constant False Alarm Rate
               CFE         Contractor Furnished Equipment
               CG          Center of Gravity, Commanding General, Command Guidance, or Cruiser
               CI          Configuration Item
               CIA         Central Intelligence Agency
               CIC         Combat Information Center (now called CDC)
               CID         Combat Identification or Charge Injection Device
               CILOP       Conversion in Lieu of Procurement
               CINC        Commander in Chief
               CIS         Commonwealth of Independent States (11 of 15 former Soviet Union
               territories except Estonia, Georgia, Latvia, and Lithuania)
               CIWS        Close-In Weapon System
               CJ          Coherent Jamming
               CLC         Command Launch Computer
               cm          Centimeter
               CM          Countermeasures or Configuration Management
               CMC         Command Mission Computer or Commandant Marine Corps
               CMDS        Countermeasure Dispensing System
               CMOS        Complementary Metal-Oxide Semiconductor
               CMP         Configuration Management Plan
               CMWS        Common Missile Warning System
               CNAL        Commander, Naval Air Forces Atlantic (COMNAVAIRLANT)
               CNAP        Commander, Naval Air Forces Pacific (COMNAVAIRPAC)
               CNI         Communications, Navigation, and Identification
               CO          Commanding Officer, Contracting Officer, Change Order, or Carbon Monoxide
               COB         Close of Business
               COEA        Cost and Operational Effectiveness Analysis
               COG         Center of Gravity or Cognizant
               COMM        Communications
               COMSEC      Communications Security
               CONSCAN     Conical Scanning Radar
               CONUS       Continental United States
               CO-OP       Cooperative (countermeasures)
               Cos         Cosine
               COSRO       Conical-Scan on Receive Only
               COTS        Commercial Off-The-Shelf (hardware/software)
               CP          Circularly Polarized (antenna), Central Processor, or Command Post
               CPS         Computer or Control Power Supply (depends on application)
               CPU         Central Processing Unit
               CRC         Originally Chemical Rubber Company, now published reference books
               by CRC Press 
               CRFM        Coherent RF Memory
               CRISD       Computer Resources Integrated Support Document
               CRLCMP      Computer Resources Life Cycle Management Plan
               CRO         Countermeasures Response Optimization
               CRT         Cathode Ray Tube or Combat Rated Thrust (afterburner)
               Crypto      Cryptographic
               CS          Conducted Susceptibility
               CSC         Commodity Software Change
               CSCI        Computer Software Configuration Item
               C-Spec      Product Specification
               CSS         Contractor Support Services
               CV          Aircraft Carrier
               CVA         Older designation for Attack Carrier
               CVN         Nuclear Powered Aircraft Carrier
               CVR         Crystal Video Receiver
               CW          Continuous Wave or Chemical Warfare
               CWBS        Contract Work Breakdown Structure
               CWI         Continuous Wave Illuminator
               CY          Calendar Year
               d           Distance, Diameter, or deci (10-1 multiplier)
               D           Distance, Diameter, Electron displacement, Detectivity, Doppler, Density,
               or Roman numeral for 500
               da          deca (100 multiplier)
               D/A         Digital-to-Analog
               DAB         Defense Acquisition Board
               DAC         Digital to Analog Converter or Dept of Army Civilian
               DAR         Defense Acquisition Regulation
               DARPA       Defense Advanced Research Projects Agency
               DB          Database
               dB          Decibel
               dBc         dB referenced to the Carrier Signal
               dBi         Decibel antenna gain referenced to an isotropic antenna
               dBm         Decibel referenced to the power of one milliwatt
               DBOF        Defense Business Operations Fund
               dBsm        Decibel value of radar cross section referenced to a square meter
               dBW         Decibel referenced to the power of one watt
               DC          Direct Current, Discrete Circuit, or District of Columbia
               DCE         Data Communication Equipment
               DDI         Digital Display Indicator
               DDS         Direct Digital Synthesizers
               DECM        Deceptive Electronic Countermeasures (also Defensive ECM)
               DEW         Directed Energy Weapon or Defense Early Warning
               DJ          Deceptive Jamming
               deg         Degree
               DEMVAL      Demonstration Validation (also DEM/VAL)
               DET         Detachment
               DF          Direction Finding
               DFT         Discrete Fourier Transform
               DI          Data Item
               DIA         Defense Intelligence Agency or Diameter
               DID         Data Item Description
               DIRCM       Directed Infrared Countermeasures
               D-Level     Depot Level Maintenance
               DM          Data Management (also manager)
               DMA         Direct Memory Address or Defense Mapping Agency
               DME         Distance Measuring Equipment
               DNA         Defense Nuclear Agency, Does Not Apply, or Deoxyribonucleic Acid
               DOA         Direction of Arrival
               DOD or DoD  Department of Defense 
               DoDISS      DoD Index of Specifications and Standards
               DOM         Depth of Modulation
               DON         Department of the Navy
               DOS         Disk Operating System
               DPRO        Defense Plant Representative Office
               DRB         Defense Review Board
               DRFM        Digital RF Memory
               DSARC       Defense Systems Acquisition (and) Review Council
               DSN         Defense Switching Network
               DSO         Dielectrically Stabilized Oscillator
               DSP         Digital Signal Processor
               D-Spec      Process Specification
               DT (&E)     Development or Developmental Test (and Evaluation)
               DTC         Design to Cost
               DTE         Data Terminal Equipment
               DTO         Digitally Tuned Oscillator or Defense Technology Objectives
               e           Electron charge or base of natural logarithms (2.71828...)
               E           Electric Field Intensity or Strength, Energy, East, or Exa (1018
               multiplier)
               E3          Electromagnetic Environmental Effects
               EA          Electronic Attack (similar to older term of ECM)
               EC          Electronic Combat
               ECAC        Electromagnetic Compatibility Analysis Center (DOD), now
               Joint Spectrum Center
               ECCM        Electronic Counter-Countermeasures (similar to newer term of EP)
               ECL         Emitter Coupled Logic
               ECM         Electronic Countermeasures (similar to newer term of EA)
               ECN         Engineering Change Notice
               ECO         Engineering Change Order
               ECP         Engineering Change Proposal or Egress Control Point
               ECR         Electronic Combat Range (China Lake) or Electronic Combat &
               Reconnaissance
               ECS         Environmental Control System
               ECSEL       Electronic Combat Simulation and Evaluation Laboratory (NAWCWPNS)
               ECU         Electronic Control Unit
               EDM         Engineering Development Model
               EED         Electro-Explosive Device
               EEPROM      Electrically Erasable/Programmable Read-only Memory
               EHF         Extremely High Frequency [30 to 300 GHz]
               EIA         Electronic Industries Associates
               EID         Emitter Identification Data
               EIRP        Effective Isotropic Radiated power
               EL          Elevation (also El)
               ELF         Extremely Low Frequency [3 Hz to 3 KHz]
               ELINT       Electronics Intelligence
               ELNOT       Emitter Library Notation
               EM          Electromagnetic
               E-Mail      Electronic Mail
               EMC         Electromagnetic Compatibility
               EMCAB       EMC Advisory Board
               EMCON       Emission Control
               EMD         Engineering and Manufacturing Development
               EME         Electromagnetic Environment
               EMI         Electromagnetic Interference
               EMP         Electromagnetic Pulse
               EMR         Electromagnetic Radiation
               EMS         Electromagnetic Susceptibility
               EMV         Electromagnetic Vulnerability
               EO          Electro-Optic, Electro-Optical, or Engineering Order
               EOB         Electronic Order of Battle or Expense Operating Budget
               EOCM        Electro-Optic Countermeasures
               EOF         Electro-Optical Frequency (300 to 3 x 107 GHz)
               EP          Electronic Protection (similar to older terms of DECM or ECCM)
               EPA         Environmental Protection Agency
               EPROM       Electrically Programmable Read-only Memory
               ERAM        Electronic Counter-Countermeasures (also Protection) Requirements and
               Assessment Manual
               ERP         Effective Radiated Power
               ES          Electronic Surveillance (similar to older term of ESM)
               ESD         Electrostatic Discharge
               ESM         Electronic Support Measures (similar to newer term of ES)
               ESSM        Evolved Sea Sparrow Missile
               ET          Electronics Technician
               ETI         Elapsed Time Indicator
               ETR         Estimated Time to Repair
               EW          Electronic Warfare or Early Warning
               EWAT        Electronic Warfare Advanced Technology
               EWIR        Electronic Warfare Integrated Reprogramming (USAF database)
               EWMP        Electronic Warfare Master Plan
               EWO         Electronic Warfare Officer
               EWOPFAC     Electronic Warfare Operational Reprogramming Facility
               EWRL        Electronic Warfare Reprogrammable Library (USN)
               EWSI        EW Systems Integration
               EWSSA       EW Software Support Activity
               EXP         Expendable Countermeasure
               f           femto (10-15 multiplier), Frequency (also F), or lens f
               number
               F           Frequency (also f), Force, Farad, Faraday Constant, Female, Fahrenheit,
               Noise Figure, Noise Factor or "Friendly" on RWR display
               F/A         Fighter/Attack
               FAA         Federal Aviation Administration
               FAC         Forward Air Controller
               FAR         Federal Acquisition Regulations
               FAX         Facsimile
               fc          Footcandle (unit of illuminance)
               FCA         Functional Configuration Audit
               FCR         Fire Control Radar
               FDR         Frequency Domain Reflectometry
               FEBA        Forward Edge of the Battle Area
               FET         Field-Effect Transistor
               FEWSG       Fleet Electronic Warfare Support Group
               FFT         Fast Fourier Transform
               FIFO        First In / First Out
               fig         Figure
               FIPR        Federal Information Processing Resources
               fl          fluid
               FLAK        AAA Shrapnel, from the German "Flieger Abwher Kanone" (AAA gun
               that fires fast and furiously)
               FLIR        Forward Looking Infrared
               FLPS        Flightline Payload Simulator
               FLT         Flight
               FM          Frequency Modulation or Failure Mode
               FME         Foreign Material Exploitation
               FMEA        Failure Mode and Effects Analysis
               FMS         Foreign Military Sale(s)
               FOC         Full Operational Capability
               FOD         Foreign Object Damage
               FORCECAP    Force Combat Air Patrol
               FOT&E       Follow-On Test and Evaluation
               FOTD        Fiber Optic Towed Device
               FOUO        For Official Use Only
               FOV         Field of View
               FPA         Focal Plane Array
               fps         feet per second
               FRACAS      Failure, Reporting, Analysis, and Corrective Actions System
               FRB         Failure Review Board
               FRD         Functional Requirements Document
               FSD         Full Scale Development
               FSED        Full Scale Engineering Development
               FSK         Frequency Shift Keying
               FSU         Former Soviet Union
               ft          Feet or Foot
               FTC         Fast Time Constant
               FTD         Foreign Technology Division (USAF)
               FWD         Forward
               FY          Fiscal Year
               g           Gravity (also G)
               G           Universal Gravitational Constant (also K), Giga (109 multiplier),
               Conductance, or Gain
               G&A         General and Administrative (expense)
               GaAs        Gallium Arsenide
               GACIAC      Guidance and Control Information Analysis Center (DoD)
               gal         Gallon
               GAO         General Accounting Office
               GBU         Guided Bomb Unit
               GCA         Ground Controlled Approach
               GCI         Ground Control Intercept
               GENSER      General Service
               GEN-X       Generic Expendable
               GFE         Government Furnished Equipment
               GHz         GigaHertz
               GI          Government Issue
               GIDEP       Government Industry Data Exchange Program
               GIGO        Garbage In / Garbage Out
               GOCO        Government Owned Contract Operated
               GP          General Purpose
               GPI         Ground Plane Interference
               GPIB        General Purpose Interface Bus
               GPS         Global Positioning System
               GSE         Ground Support Equipment
               h           hours, hecto (102 multiplier), Plank's constant, or
               height (also H)
               H           Height (also h), Henry (Inductance), or Irradiance
               HARM        High-speed Anti-Radiation Missile
               HAWK        Homing All the Way Killer
               HDBK        Handbook
               HDF         High Duty Factor
               HE          High Explosive
               HEF         High Energy Frequency (3x107 to 3x1014 GHz)
               HEL         High Energy Laser
               HELO        Helicopter
               HERF        Hazards of Electromagnetic Radiation to Fuel
               HERO        Hazards of Electromagnetic Radiation to Ordnance
               HERP        Hazards of Electromagnetic Radiation to Personnel
               HF          High Frequency [3 - 30 MHz]
               HIL         Hardware-in-the-Loop
               HOJ         Home-On-Jam
               HOL         Higher Order Language
               HP-IB       Hewlett-Packard Interface Bus
               HP-IL       Hewlett-Packard Interface Loop
               HPM         High Powered Microwave
               HPRF        High Pulse Repetition Frequency
               hr          hour
               HSDB        High Speed Data Bus
               HUD         Heads-Up Display
               HV          High Voltage
               H/W         Hardware
               HWIL        Hardware-in-the-loop
               Hz          Hertz (Cycles per second)
               i           current (also I)
               I           Current (also i), Intensity, Irradiance, Intermediate, or
               Roman Numeral for One
               IADS        Integrated Air Defense System
               I&Q         In-Phase and Quadrature
               IAS         Indicated Airspeed
               IAW         In Accordance With
               IBIT        Initiated Built-in-Test
               IBU         Interference Blanker Unit
               IC          Integrated Circuit
               ICD         Interface Control Document
               ICMD        Improved Countermeasure Dispenser
               ICNIA       Integrated Communication, Navigation, Identification Avionics
               ICS         Inverse Conical Scan or Intercommunications System (aircraft)
               ICW         In Compliance With
               ID          Identification
               IDA         Institute For Defense Analysis
               IDAP        Integrated Defensive Avionics Program
               IDECM       Integrated Defensive Electronic Countermeasures
               IEEE        Institute of Electrical and Electronic Engineers
               IF          Intermediate Frequency 
               IFF         Identification Friend-or-Foe
               IFM         Instantaneous Frequency Measurement
               IFR         Instrument Flight Rules
               IG          Inspector General
               IIR         Imaging Infrared
               I-Level     Intermediate Level of Repair (also "I" Level)
               ILS         Integrated Logistic Support, Instrument Landing System, or
               Inertial Locator System
               ILSMT       Integrated Logistic Support Management Team
               IM          Intermodulation or Item Manager
               IMA         Intermediate Maintenance Activity
               in          Inch
               INEWS       Integrated Electronic Warfare System
               INS         Inertial Navigation System
               INT         Intensity
               I/O         Input/Output
               IOC         Initial Operational (also Operating) Capability
               IOT&E       Initial Operational Test and Evaluation
               IPO         International Projects (Program) Office
               IPR         In-Progress/Process Review
               IPT         Integrated Product (also Program) Team
               IR          Infrared
               IR&D        Independent Research and Development
               IRCM        Infrared Countermeasures
               IRDS        Infrared Detecting System
               IREXP       IR Expendables
               IRIG-B      Inter-range Instrumentation Group B
               IRLS        Infrared Line Scanner
               IRS         Interface Requirements Specification or Internal Revenue Service
               IRST        Infrared Search and Track
               ISAR        Inverse Synthetic Aperture Radar
               ISO         Derived from the Greek "isos" meaning "equal", the official title is
               International Organization for Standardization
               ISP         Integrated Support Plan
               ISR         Interference to Signal Ratio (also I/S)
               ITU         International Telecommunications Union
               IV&V        Independent Validation and Verification
               IW          Information Warfare
               J           Jamming, Radiance, Current Density, or Joules
               JAAS        Joint Architecture for Aircraft Survivability
               JAFF        Jammer (illuminating) Chaff
               JAG         Judge Advocate General
               JAMS        Jamming Analysis Measurement System
               JASSM       Joint Air-to-Surface Standoff Missile
               JAST        Joint Advanced Strike Technology
               JATO        Jet Assisted Takeoff or Jammer Technique Optimization
               JC2WC       Joint Command and Control Warfare Center
               JCS         Joint Chiefs of Staff or Joint Spectrum Center (formerly ECAC)
               JDAM        Joint Direct Attack Munition
               JED         Journal of Electronic Defense (Published by the Association of Old Crows)
               JEM         Jet Engine Modulation
               JETS        Joint Emitter Targeting System
               JEWC        Joint EW Conference or Joint EW Center (now JC2WC)
               JMR         Jammer
               JOVIAL      Julius' Own Version of International Algorithmic Language
               (Air Force computer programming language)
               JPATS       Joint Primary Aircraft Training System
               J/S         Jamming to Signal Ratio
               JSF         Joint Strike Fighter
               JSGCC       Joint Services Guidance and Control Committee
               JSIR        Joint Spectrum Interference Resolution (the signal interference
               portion of MIJI)
               JSOW        Joint Stand-Off Weapon (AGM-154A)
               JSTARS      Joint Surveillance Target Attack Radar System
               JTCG/AS     Joint Technical Coordinating Group for Aircraft Survivability
               JTIDS       Joint Tactical Information Distribution System
               JV or J/V   Joint Venture
               k           kilo (103 multiplier) or Boltzmann Constant
               K           Kelvin, Cathode, Universal gravitational constant (also G), or
               Luminous efficacy
               KCAS        Knots Calibrated Airspeed
               kg          kilogram
               kHz         KiloHertz
               KIA         Killed in Action
               KIAS        Knots Indicated Air Speed
               km          Kilometer
               KSLOC       Thousand Source Lines of Code (software)
               kt          Knot (nautical miles per hour)
               kW          Kilowatt
               l           length (also L) or liter
               L           Length (also l), Loss, inductance, Luminance, or Roman Numeral for fifty
               LADAR       Laser Detection and Ranging (i.e., laser radar)
               LAN         Local Area Network
               LANTIRN     Low Altitude Navigation & Targeting Infrared for Night
               LASER       Light Amplification by Stimulated Emission of Radiation
               LAT         Latitude (0-90 deg N or S from equator)
               lbs         pounds
               LCC         Life Cycle Cost(s)
               LCD         Liquid Crystal Display or Lowest Common Denominator
               LCP         Left-hand Circular Polarization
               LDF         Low Duty Factor
               LDS         Laser Detecting Set
               LED         Light-Emitting Diode
               LEX         Leading Edge Extension
               LGB         Laser Guided Bomb
               LF          Low Frequency [30 - 300 kHz]
               LIC         Low Intensity Combat or Laser Intercept Capability
               LISP        List Processing (A programming language used in artificial intelligence)
               LLL         Low Light Level (as in LLL TV)
               lm          lumen (SI unit of luminous flux)
               ln          Natural Logarithm
               LO          Local Oscillator or Low Observable
               LOA         Letter of Agreement (or Acceptance)
               LOB         Line of Bearing (see also AOA)
               LOG         Logarithm to the base 10 (also log) or Logistician
               LONG        Longitude (0-180 deg E or W from Greenwich, U.K.)
               LOR         Level of Repair 
               LORA        Level of Repair Analysis
               LORAN       Long Range Navigation
               LORO        Lobe on Receive Only
               LOS         Line-of-Sight
               LPAR        Large Phased-Array Radar
               LPD         Low Probability of Detection
               LPI or LPOI Low Probability of Intercept
               LPRF        Low Pulse Repetition Frequency
               LR          Lethal Range
               LRA         Line Replaceable Assembly
               LRF         Laser Rangefinder
               LRIP        Low Rate Initial Production
               LRU         Line Replaceable Unit
               LSA         Logistic Support Analysis
               LSAR        Logistic Support Analysis Record
               LSB         Least Significant Bit
               LSI         Large Scale Integration
               LSO         Landing Signal Officer
               LSSO        Laser System Safety Officer
               LTBB        Look Through Blanking Bus
               LWIR        Long Wave Infrared
               LWR         Laser Warning Receiver
               lx          Lux (SI unit of illuminance)
               LZ          Landing Zonem           milli (10-3 multiplier), meter, or electron mass
               M           Mega (106 multiplier), Male, Mach number, or Roman numeral for 1,000
               MA          Missile Alert or Missile Active
               MAD         Magnetic Anomaly Detection (also Detector)
               MADD        Microwave Acoustic Delay Device
               MAF         Maintenance Action Form
               MAG         Marine Aircraft Group or Magnetic
               MANPADS     Man-Portable Air Defense System
               M&S         Modeling and Simulation
               MASER       Microwave Amplification by Simulated Emission of Radiation
               MATE        Modular Automatic Test Equipment
               MAW         Missile Approach Warning system (also MAWS) or Marine Aircraft Wing
               MAX         Maximum or Maximum aircraft power (afterburner)
               MBFN        Multiple Beam Forming Network
               MC          Mission Computer
               MCP         Micro-Channel Plate
               MDF         Mission Data File
               MDI         Multiple Display Indicator or Miss Distance Indicator
               MDG         Mission Data Generator
               MDS         Minimum Discernible Signal or Minimum Detectable Signal
               MDU         Multipurpose Display Unit
               MF          Medium Frequency (300 kHz to 3 MHz)
               MFD         Multifunction (video) Display
               MG          Missile Guidance
               MHz         MegaHertz (106 Hz)
               MIA         Missing in Action
               MIC         Microwave Integrated Circuit or Management Information Center
               MICRON      10-6 meter
               MiG         Mikoyan-Gurevich (Soviet aircraft manufacturer)
               MIGCAP      MiG Combat Air Patrol
               MIJI        Meaconing, Intrusion, Jamming, & Interference (also see JSIR)
               mil         One-thousandth of an inch
               MIL         Military power (100%, no afterburner) or Military
               MILCON      Military Construction
               MILSPEC     Military Specification
               MILSTRIP    Military Standard Requisitioning and Issue Procedure(s)
               MIMIC       Microwave Monolithic Integrated Circuit (also MMIC)
               MIN         Minimum
               MIPPLE      RWR display switching between ambiguous emitters
               MIPS        Millions of (Mega) Instructions Per Second
               ML          Missile Launch
               MLC         Main Lobe Clutter
               MLV         Memory Loader Verifier
               MLVS        Memory Loader Verifier Set
               mm          Millimeter
               MM          Man Month
               MMIC        Microwave Monolithic Integrated Circuit (also MIMIC)
               MMW         Millimeter Wave (40 GHz or higher per IEEE, but commonly used
               down to 30 GHz)
               MOA         Memorandum of Agreement
               MOAT        Missile on Aircraft Test (Phoenix test on F-14)
               MOE         Measure of Effectiveness
               MOM         Methods of Moments (also MoM) or Metal-Oxide-Metal
               MOP         Modulation on Pulse or Measure of Performance
               MOPS        Million Operations Per Second
               MOS         Minimum Operational Sensitivity, Military Occupational Specialty, 
               Metal-Oxide Semiconductor, or Measure of Suitability
               MOSAIC      Modeling System for Advanced Investigation of Countermeasures
               MOU         Memorandum of Understanding
               MPD         Multi-Purpose Display or Microwave Power Device
               MPE         Maximum Permissible Exposure
               mph         Miles per Hour
               MPLC        Multi-Platform Launch Controller
               MPM         Microwave Power Module
               MPPS        Million Pulses Per Second
               MPRF        Medium Pulse Repetition Frequency
               mr or mrad  Milliradian
               MRC         Maintenance Requirement Card or Medium Range CAP
               MRE's       Meals Ready to Eat
               ms          Milliseconds
               MSB         Most Significant Bit
               MSI         Multi-Sensor (also Source) Integration, Management Support Issues, or
               Medium Scale Integration
               MSIC        Missile and Space Intelligence Center
               MSL         Mean Sea Level (altitude) or Missile
               MTBF        Mean Time Between Failures
               MTI         Moving Target Indicator (or Indication)
               MTTR        Mean Time To Repair
               MUXBUS      Multiplex Bus
               MVS         Minimum Visible Signal
               mw          Microwave
               mW          Milliwatt
               MWIR        Mid Wave Infrared
               MWS         Missile Warning Set
               MY          Man Year
               n           nano (10-9 multiplier) or number of elements
               N           Noise, Newton (force), Radiance, North, or No
               n/a         Not Applicable (also N/A)
               NA          Numerical Aperture
               NAC         Naval Avionics Center (now part of NAWCAD)
               NADC        Naval Air Development Center (now part of NAWCAD)
               NADEP       Naval Aviation Depot
               NASA        National Aeronautics and Space Administration
               NATC        Naval Air Test Center (now part of NAWCAD)
               NATO        North Atlantic Treaty Organization
               NATOPS      Naval Air Training and Operating Procedures Standardization
               NAV         Navigation
               NAVAIR      Naval Air Systems Command (also NAVAIRSYSCOM)
               NAVSEA      Naval Sea Systems Command (also NAVSEASYSCOM)
               NAWCAD      Naval Air Warfare Center Aircraft Division (formerly Trenton,
               NADC, NAC, and NATC)
               NAWCWPNS    Naval Air Warfare Center Weapons Division (formerly PMTC, NWC,
               NWEF, and NOMTS)
               NBC         Nuclear, Biological, Chemical
               NCTR        Non-Cooperative Target Recognition
               NDI         Non-Developmental Item or Non Destructive Inspection
               NEI         Noise Equivalent Power
               NEMP        Nuclear Electromagnetic Pulse
               NEOF        No Evidence of Failure
               NEP         Noise Equivalent Power
               NF          Noise Figure or Noise Factor (also F)
               NFO         Naval Flight Officer
               NIPO        Navy International Program Office
               NIR         Near Infrared
               NISC        Naval Intelligence Support Center
               nm          nanometer or Nautical Mile (also NM or NMI)
               NM or NMI   Nautical Mile (also nm)
               NOHD        Nominal Ocular Hazard Distance
               NOMTS       Naval Ordnance Missile Test Station, White Sands, NM
               (now part of NAWCWPNS)
               NORAD       North American Air Defense Command
               NPG or NPGS Naval Post Graduate School
               NRE         Non-Recurring Engineering
               NRL         Naval Research Laboratory
               NRZ         Non Return to Zero
               NSA         National Security Agency
               nsec or ns  Nanosecond
               NSN         National Stock Number
               NSWC        Naval Surface Weapons Center
               nt          Nit (SI unit of luminance)
               NVG         Night Vision Goggles
               NWC         Naval Weapons Center (China Lake) now part of NAWCWPNS
               NWEF        Naval Weapons Evaluation Facility, Albuquerque, NM (now part of NAWCWPNS)
               NWIP        Naval Warfare Information Publication
               NWP         Naval Warfare Publication
               O           Optical
               OADR        Originating Agency's Determination Required
               OAG         Operational Advisory Group
               O&MN        Operations and Maintenance, Navy (also O&M,N)
               OBE         Overtaken (Overcome) By Events
               OCA         Offensive Counter Air
               OEWTPS      Organizational Electronic Warfare Test Program Set
               OFP         Operational Flight Program
               OJT         On-the-Job Training
               O-Level     Organizational Level of Repair (also "O" Level)
               OMA         Organizational Maintenance Activity
               OMB         Office of Management and Budget
               OMEGA       Optimized Method for Estimating Guidance Accuracy (VLF Navigation System)
               ONR         Office of Naval Research
               OOK         On-Off Keying
               OPEVAL      Operational Evaluation
               OPM         Office of Personnel Management
               OPSEC       Operational Security
               OPTEVFOR    Operational Test and Evaluation Force
               OR          Operational Requirement or Operationally Ready
               ORD         Operational Requirements Document
               OSD         Office of the Secretary of Defense
               OSHA        Occupational Safety and Health Act
               OSIP        Operational Safety Improvement Program
               OSM         Operating System Memory or SMA connector made by Omni-Spectra
               OSUD        Office of the Under Secretary of Defense
               OT (&E)     Operational Test (and Evaluation)
               OTD         Operational Test Director
               OTH         Over the Horizon
               OTH-B       Over-the-Horizon Backscatter
               OTH-R       Over-the-Horizon Radar
               OTH-T       Over-the-Horizon Targeting
               OTRR        Operational Test Readiness Review
               oz          ounce
               p           pico (10-12 multiplier) or page
               P           Power, Pressure, or Peta (1015 multiplier)
               P3I         Pre-Planned Product Improvement
               Pa          Pascal (pressure)
               PA          Public Address or Program Analyst
               PBIT        Periodic Built-in-Test
               PC          Pulse Compression, Personal Computer, or Photoconductive
               PCA         Physical Configuration Audit
               PCM         Pulse Code Modulation
               Pd          Probability of Detection
               PD          Pulse Doppler
               PDI         PD Illuminator or Post Detection Integration
               PDP         Plasma Display Panel
               PDQ         Pretty Darn [sic] Quick
               PDR         Preliminary Design Review
               PDW         Pulse Descriptor Word
               PEL         Personnel Exposure Limits
               PEM         Photoelectromagnetic
               PEO         Program Executive Officer
               pf          Power Factor or Pico Farads
               PFA         Probability of False Alarm
               PGM         Precision Guided Munition
               ph          Phot (unit of illuminance)
               Ph          Probability of Hit
               pi          Greek letter 
               Pi          Probability of Intercept (also POI)
               PID         Positive Identification
               PIN         Personal Identification Number
               PIP         Product Improvement Plan or Predicted Intercept Point
               Pixel       Picture Element
               Pk          Probability of Kill or Peak
               PLSS        Precision Location Strike System
               PM          Phase Modulation or Program Manager
               PMA         Program (also Project) Manager, Air
               PMAWS       Passive Missile Approach Warning System
               PMT         Photomultiplier Tube
               PMTC        Pacific Missile Test Center (PACMISTESTCEN) - now part of NAWCWPNS
               P-N         Positive to Negative Junction (also p-n)
               PN or P/N   Part Number
               POC         Point of Contact
               POET        Primed Oscillator Expendable Transponder
               POI         Probability of Intercept (also PI)
               POL         Polarization
               POM         Program Objective Memorandum
               POP         Pulse-on-Pulse or Product Optimization Program
               POST        Passive Optical Seeker Technology (Stinger missile)
               PPI         Plan Position Indicator
               PPS         Pulses Per Second
               PRF         Pulse Repetition Frequency
               PRI         Pulse Repetition Interval or Priority
               PROM        Programmable Read-only Memory
               PRR         Production Readiness Review or Pulse Repetition Rate
               PRT         Pulse Repetition Time
               Ps          Probability of Survival
               P's & Q's   Pints and Quarts (small details)
               PSK         Phase-shift Keying
               PUPS        Portable Universal Programming System
               PV          Photovoltaic
               pw or PW    Pulse Width
               PWB         Printed Wiring Board
               q           electron charge
               Q           Quantity Factor (figure of merit), Quadrature, Aerodynamic pressure, 
               or Charge (coulomb)
               QA          Quality Assurance
               QC          Quality Control
               QED         Quod Erat Demonstradum (end of proof)(Satirically "quite easily done")
               QML         Qualified Manufacturer Listing
               QPL         Qualified Parts List
               QRC         Quick-Reaction Capability
               QRD         Quick Reaction Demonstration
               QRT         Quick-Reaction test
               r or R      Radius or Range
               R           Resistance, Reliability, or Roentgen
               rad         Radian
               R&D         Research and Development
               RADAR       Radio Detection and Ranging
               RADHAZ      Radiation Hazard
               RAM         Random Access Memory, Radar Absorbing Material, Rolling Airframe
               Missile, or Reliability, Availability, and Maintainability
               R&M         Reliability and Maintainability
               R&R         Rest and Recouperation (Relaxation)
               RAT         Ram Air Turbine
               RBOC        Rapid Blooming Offboard Chaff
               RCP         Right-hand Circular Polarization
               RCS         Radar Cross Section
               RCVR        Receiver
               RDT&E       Research, Development, Test, & Evaluation
               RDY         Ready
               RE          Radiated Emissions
               REC         Receive
               RET         Return
               RF          Radio Frequency
               RFEXP       RF Expendables
               RFI         Radio Frequency Interference, Ready-For-Issue, or Request for Information
               RFP         Request for Proposal
               RFQ         Request for Quotation
               RFSS        Radio Frequency Simulation System (Army)
               RGPO        Range Gate Pull Off
               RGS         Range Gate Stealer
               RGWO        Range Gate Walk Off (see RGPO)
               RHAW        Radar Homing and Warning Receiver or Radar Homing All the Way
               RHAWS       Radar Homing and Warning System
               RINT        Radiation Intelligence
               RIO         Radar Intercept Officer
               RM          Radar Mile
               rms or RMS  Root Mean Square
               RNG         Range
               ROC         Required Operational Capability
               ROE         Rules of Engagement
               ROI         Return on Investment
               ROM         Read-only Memory or Rough Order of Magnitude
               ROR         Range Only Radar or Rate of Return (financial)
               ROT         Rate of Turn
               ROWG        Response Optimization Working Group
               RPG         Receiver Processor Group
               RPM         Revolutions per Minute
               RPT         Repeat
               RPV         Remotely Piloted Vehicle
               RRT         Rapid Reprogramming Terminal (a type of MLVS)
               RS          Radiated Susceptibility or Remote Station 
               RSDS        Radar Signal Detecting Set
               RSO         Range Safety Officer or Receiver, Set-on
               RST         Receiver Shadow Time
               RT          Remote Terminal, Termination Resistance, or Receiver/Transmitter
               (also R/T)
               RUG         Radar Upgrade
               RWR         Radar Warning Receiver
               Rx          Receive
               s, S, or sec  seconds
               S           Signal Power, Surface Area, Secret, Electrical conductance (siemens),
               South, Scattering (as in S-parameters), or Seconds
               SA          Situational Awareness, Semi-Active, Spectrum Analyzer, or
               Surface-to-Air(also S/A or S-A)
               SA-()       Surface-to-Air missile number ()
               SAE         Society of Automotive Engineers
               SAM         Surface-to-Air Missile
               SA-N-()     Naval Surface-to-Air missile number ()
               SAR         Synthetic Aperture Radar, Special Access Required, Semi-Active
               Radar, Search and Rescue, or Specific Absorption Rate
               SATO        Scheduled Airline Traffic Office
               SATS        Semi-Active Test System
               SAW         Surface Acoustic Wave
               SBIR        Small Business Innovative Research
               SCI         Sensitive Compartmented Information
               SCIF        Sensitive Compartmented Information Facility
               SCN         Specification Change Notice
               SCRB        Software Configuration Review Board
               SCUBA       Self-Contained Underwater Breathing Apparatus
               SCUD        Soviet short-range surface-to-surface missile
               SE          Support Equipment
               SDLM        Standard Depot Level Maintenance
               SDI         Strategic Defense Initiative
               Seabee      Someone in the Navy Construction Battalion ("CB")
               SEAD        Suppression of Enemy Air Defense (pronounced "seed" or "C add")
               SEAL        Sea-Air-Land (Navy special forces)
               sec         seconds (also S or s)
               SECDEF      Secretary of Defense
               SEI         Specific Emitter Identification
               SEMA        Special Electronic Mission Aircraft
               SERD        Support Equipment Recommendation Data
               SHAPE       Supreme Headquarters Allied Powers Europe (NATO military command)
               SHF         Super High Frequency (3 to 30 GHz)
               SI          Special Intelligence or System International (Units)
               SIF         Selective Identification Feature
               SIGINT      Signals Intelligence
               SIJ         Stand-In Jamming (also S/J)
               SIM         Simulation
               sin         Sine
               SINCGARS    Single Channel Ground and Airborne Radio System
               SIRFC       Suite of Integrated RF Countermeasures (includes ATRJ and ATIRCM)
               SJ          Support Jamming
               S/J         Stand-In Jamming or Signal to Jamming Ratio
               SL          Sidelobe or Sea Level (also S.L.)
               SLAM        Standoff Land Attack Missile
               SLAR        Side-Looking Airborne Radar
               SLC         Side Lobe Clutter
               SLOC        Source Lines of Code or Sea Lines of Communication
               SM          Statute Mile (also sm) or Standard Missile
               SMA         Scheduled Maintenance Action or Sub-Miniature A connector
               SMC         Sub-Miniature C connector
               SML         Support Material List
               SMS         Stores Management Set or Status Monitoring System
               S/N or SNR  Signal-to-Noise Ratio
               SNORT       Supersonic Naval Ordnance Research Track
               SNTK        Special Need to Know
               SOF         Safety of Flight
               SOJ         Stand-off Jammer
               SONAR       Sound Navigation and Ranging
               SOO         Statement of Objectives (replacing SOW)
               SOP         Standard Operating Procedures
               SORO        Scan-on-Receive Only
               SOS         "Save Our Ship" (distress call with easy Morse code, i.e. ...---...) 
               SOW         Statement of Work (being replaced by SOO)
               SPAWAR      Space and Naval Warfare Systems Command
               SPEC        Specification
               SPIRITS     Spectral Infrared Imaging of Targets and Scenes
               SPO         System Program Office
               SPY         Radar on an AEGIS ship
               sq          Square
               sr          Steradian
               SRA         Shop Replaceable Assembly
               SRAM        Static Random Access Memory
               SRB         Software Review Board
               SRBOC       Super Rapid Blooming Offboard Chaff
               SRD         Systems Requirements Document
               SRS         Software Requirements Specification
               SRU         Shop Replaceable Unit
               SSA         Software (also Special or System) Support Activity, Source Selection
               Activity, or Solid State Amplifier
               SSB         Single Side Band
               SSBN        Nuclear Ballistic Missile Submarine
               SSGN        Nuclear Guided Missile Submarine
               SSI         Small Scale Integration
               SSJ         Self Screening Jamming
               SSM         Surface-to-Surface Missile
               SSN         Nuclear Attack Submarine
               SSRO        Sector Scan Receive Only
               SSW         Swept Square Wave
               S&T         Science and Technology
               STANAG      Standardization Agreement (NATO)
               STAR        System Threat Assessment Report
               stat        Statute
               STBY        Standby
               STC         Sensitivity Time Control, Short Time Constant or SHAPE Technical Center
               STD         Software Test Description, Standard, or Sexually Transmitted Disease
               STOVL       Short Takeoff and Vertical Landing
               STP         Software Test Plan, or Standard Temperature and Pressure
               (0 deg C at 1 atmosphere)
               STR         Software (also System) Trouble Report
               STT         Single Target Track
               STU         Secure Telephone Unit
               SUBSAM      Subsurface-to-Air Missile
               SUT         System Under Test
               S/W         Software (also SW)
               SWC         Scan With Compensation
               SWM         Swept Wave Modulation
               SYSCOM      Systems Command
               t           Time (also T)
               T           Time (also t), tera (10 12 multiplier), Temperature, or Telsa
               TA          Target Acquisition or Terrain Avoidance
               TAAF        Teat, Analyze, and Fix
               TAC         Tactical Air Command (Air Force)
               TACAIR      Tactical Aircraft
               TACAMO      Take Charge and Move Out (airborne strategic VLF communications
               relay system)
               TACAN       Tactical Air Navigation
               TACDS       Threat Adaptive Countermeasures Dispensing System
               TACTS       Tactical Aircrew Combat Training System
               TAD         Threat Adaptive Dispensing, Temporary Additional (also Active)
               Duty, or Tactical Air Direction
               T&E         Test & Evaluation
               TALD        Tactical Air Launched Decoy
               TAMPS       Tactical Automated Mission Planning System
               TAR         Target Acquisition Radar or Training Administrative Reserve
               TARPS       Tactical Air Reconnaissance Pod System (used on F-14)
               TAS         True Airspeed
               TAWC        Tactical Air Warfare Center (Air Force)
               TBA         To Be Announced
               TBD         To Be Determined
               TBMD        Theater Ballistic Missile Defense
               TD          Technical Directive (also Director)
               TDD         Target Detection Device
               TDM         Time Division Multiplexing
               TE          Transverse Electric
               TEA         Technology Exchange Agreement
               TEAMS       Tactical EA-6B Mission Support
               TECHEVAL    Technical Evaluation
               TEL         Transporter Erector Launcher
               TEM         Transverse Electromagnetic
               TEMP        Test and Evaluation Master Plan
               TEMPEST     Not an acronym.  Certification of reduced electromagnetic
               radiation for security considerations
               TERPES      Tactical Electronic Reconnaissance Processing and Evaluation System
               TGT         Target
               TIM         Technical Interchange Meeting
               TM          Telemetry, Transverse Magnetic, or Technical Manual
               TMD         Theater Missile Defense
               TNC         Threaded Navy Connector
               TOA         Time of Arrival
               TOJ         Track on Jam
               TOO         Target of Opportunity (HARM operating mode)
               TOR         Tentative (also Tactical) Operational Requirement or Time of Receipt
               TOS         Time on Station
               TOT         Time on Target
               TOW         Tube-Launched, Optically-Tracked, Wire-guided
               TPI         Test Program Instruction
               TPS         Test Program Set or Test Pilot School
               TPWG        Test Plan Working Group
               TQM         Total Quality Management
               T/R         Transmit / Receive
               TRB         Technical Review Board
               TRD         Test Requirements Document
               TREE        Transient Radiation Effects on Electronics
               TRF         Tuned Radio Frequency
               TRR         Test Readiness Review
               TS          Top Secret
               TSS         Tangential Sensitivity
               TSSAM       Tri-Service Standoff Attack Weapon
               TT          Target Track
               TTG         Time To Go
               TTI         Time To Impact/Intercept
               TTL         Transistor-Transistor Logic
               TTR         Target Tracking Radar
               TV          Television
               TVC         Thrusy Vector Control
               TWS         Track While Scan or Tail Warning System
               TWSRO       Track While Scan on Receive Only
               TWT         Travelling Wave Tube
               TWTA        Travelling Wave Tube Amplifier
               Tx          Transmit
               TYCOM       Type Commander
               u           micron / micro (10-6 multiplier)
               U           Unclassified, Unit, or Unknown (on RWR display)
               UAV         Unmanned (also uninhabited) Air (or Aerial) Vehicle
               UCAV        Uninhabited Combat Air Vehicle (new USAF term for UAV)
               UDF         User Data File
               UDFG        User Data File Generator
               UDM         User Data Module
               UHF         Ultra High Frequency (300 MHz to 3 GHz)
               ULF         Ultra Low Frequency (3 to 30 Hz)
               um          Micrometer
               UN          United Nations
               UNK         Unknown (also U)
               UPS         Uninterruptable Power Supply
               us or  s    Microseconds
               U.S.        United States
               USA         United States of America or United States Army
               USAF        United States Air Force
               USMC        United States Marine Corps
               USN         United States Navy
               UTA         Uninhabited Tactical Aircraft
               UUT         Unit Under Test
               UV          Ultraviolet
               v           Volts (also V), Velocity (also V or vt)
               V           Volts (also v), Velocity (also v or vt), Volume, or
               Roman Numeral for five
               VA          Veterans Administration, Volt-Amperes, or prefix for a
               Navy attack squadron
               VAQ         Prefix for Navy (or Marine) tactical EW squadron
               V&V         Validation and Verification
               VCO         Voltage Controlled Oscillator
               Vdc or VDC  Volts Direct Current
               VDT         Video Display Terminal
               VECP        Value Engineering Change Proposal
               VF          Prefix for Navy fighter squadron
               VFO         Variable Frequency Oscillator
               VFR         Visual Flight Rules
               VGPO        Velocity Gate Pull Off
               VGS         Velocity Gate Stealer
               VGWO        Velocity Gate Walk Off
               VHF         Very High Frequency (30 - 300 MHz)
               VHSIC       Very High Speed Integrated Circuit
               VID         Visual Identification
               VLF         Very Low Frequency (3 to 30 kHz)
               VLSI        Very Large Scale Integration
               VLSIC       Very Large Scale Integrated Circuit
               VP          Prefix for Navy patrol squadron
               VQ          Prefix for Navy special mission (usually reconnaissance) squadron
               VRAM        Video Random Access Memory
               VS or vs    Velocity Search or Versus (also vs.)
               V/STOL      Vertical/Short Take-off and Landing (also VSTOL)
               vt          Velocity (also V or v)
               VTOL        Vertical Takeoff and Landing
               VSWR        Voltage Standing Wave Ratio
               VVA         Voltage Variable Attenuator
               W           Watts, Weight, or West
               W&T         Warning & Targeting
               WARM        Wartime Reserve Mode
               wb          Weber (magnetic flux)
               WBS         Work Breakdown Structure
               WC          Waveguide, circular
               WGIRB       Working Group on Infrared Background
               WIA         Wounded in Action
               WORM        Write Once Read Many [times] (Refers to optical disks)
               WOW         Weight on/off Wheels (also WonW or WoffW)
               WPAFB       Wright-Patterson Air Force Base
               WPN         Weapons Procurement, Navy or Weapon
               WR          Waveguide, rectangular
               WRA         Weapon Replaceable Assembly
               WRD         Waveguide, rectangular double ridged
               WSSA        Weapons System Support Activity
               WVR         Within Visual Range
               x           Multiplication symbol
               X           Reactance, Experimental, Extraordinary, Roman Numeral for ten, or X axis
               X-EYE       Cross Eye
               XO          Executive officer
               X-POL       Cross Polarization
               XMIT        Transmit
               Y           Yes or Y-Axis
               YAG         Yttrium-Aluminum Garnet
               yd          Yard
               YIG         Yttrium-Iron Garnet
               Z           Impedance, Zenith, or Z-Axis
               1xLR, 2xLR    One (or two or three etc.) Times Lethal Range
               1v1 or 1-v-1  One versus One (Aerial engagement)
               2D          Two Dimension
               3D          Three Dimension
               3M          Navy Maintenance and Material Management System 
              
 

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