A - Ampere
ACEC - Advisory Committee on Electromagnetic Compatibility
ACGIH - American Conference of Governmental Industrial Hygienists
ADS - Automatic Dependent Surveillance
ADSL - Asymmetric Digital Subscriber Loop
AES - Audio Engineering Society
AF - Antenna Factor
AFSATCOM - Air Force Satellite Communications
AG - Amplifier Gain
AGMC - Aerospace Guidance and Metrology Center
AFLC - Air Force Logistics Command
AIRU - Air University
AM - Amplitude Modulation
AMSAT - The Radio Amateur Satellite Corporation
ANSI - American National Standards Institute
APS - Antennas and Propagation Society of IEEE
ASK - Amplitude Shift Keying
ATCRBS - Air Traffic Control Radar Beacon System
ATM - Asynchronous Transfer Mode
ATSC - Advanced Television Systems Committee
ATV - Advanced Television
AU - Astronomical Unit
AVD - Average Voltage Detector
B - Magnetic Flux Density
B - Susceptance
BC - Boundary Condition
BEI - Biological Exposure Indicies
BICON - Biconical Antenna
BJT - Bipolar Junction Transistor
BNL - Bio-Nucleonics Laboratory
BPL - Broadband over Power Lines
BST - Barium Strontium Titanate
BW - Band Width or Beam Width
BWA - Backward Wave Amplifier
BWFN - Beam Width First Nulls
BWO - Backward Wave Oscillator
C - Coulomb
C - Capacitance
CATV - Cable Television
CCD - Charged Coupled Device
CCIR - International Radio Consultative Committee
CCITT - Consultative Committee on International Telephony and Telegraphy
CCTV - Closed Circuit Television
CDMA - Code Division Multiple Access
CDRH - Center for Device and Radiological Health
CE - Conducted Emission
CENELEC - European Committee for Electrotechnical Standardization
CERN - European Nuclear Research Organization in Geneva, Switzerland
CFA - Crossed Field Amplifier
CFR - Code of Federal Regulations
CFT - Crossed Field Tube
CP - Circular Polarization
CT - Computed Tomography
CIA - Central Intelligence Agency
CIA - Complex Impedance Analysis
CISPR - International Special Committee on Radio Interference
CMOS - Complementary Metal Oxide Semiconductor
CNR - Carrier to Noise Ratio
COBE - COsmic Background Explorer
CoDec - Coder Decoder
COMINT - Communications Intelligence
COMSAT - Communications Satellite Corporation
COMSEC - Communications Security
COMSOC - Communications Society of IEEE
COTS - Commercial Off-The-Shelf
CTIA - Cellular Telecommunications Industry Association
Cs - Caesium or Cesium
CS - Conducted Susceptibility
CSS - Chirp Spread Spectrum
CsUTC - Cesium-based UTC (time-frequency-phase) Observatory
CW - Continuous Wave
D - Electric Flux Density
dB - deciBel
dB/Hz - deciBel per Hertz
dBa - deciBel above adjusted reference noise
DBA - Digital Beam Forming
dBc - deciBel relative to the carrier
dBc/Hz - deciBel relative to the carrier per Hertz
dBd - deciBel referenced to a standard dipole
dBi - deciBel referenced to an isotropic radiator
dBm - deciBel referenced to 1 millWatt (50 ohm impedance assumed)
dBmA - deciBel referenced to 1 milliAmpere
dBrn - deciBel referenced above reference noise
DBS - Direct Broadcast Satellite
dBuA - deciBel referenced to 1 microAmpere
dBuV - deciBel referenced to 1 microVolt across 50 ohms
dBuV/m - deciBel referenced to 1 microVolt per meter
dBuV/MHz - deciBel referenced to 1 microVolt per MegaHertz
dBuV/MHz/m - deciBel referenced to 1 microVolt per MegaHertz per meter
dBuW - deciBel referenced to 1 microWatt
dBV - deciBel referenced to 1 Volt across 50 ohms
dBW - deciBel referenced to 1 Watt
DDS - Direct Digital Synthesis
DFT - Discrete Fourier Transform
DGPS - Differential Global Position System
DIA - Defense Intelligence Agency
DISA - Defense Information Systems Agency
DM - Delta Modulation
DME - Distance Measuring Equipment
DoD - Department of Defense
DoE - Department of Energy
DSL - Digital Subscriber Loop
DSO - Digital Storage Oscilloscope
DSO - Defense Spectrum Organization
DSSS - Direct Sequence Spread Spectrum
DTMF - Dual Tone Multiple Frequencies
DTV - Digital Television
DUT - Device Under Test
E - Electric Field
EBU - European Broadcasting Union
EC - European Commission
ECM - Electronic Counter Measures
ECCM - Electronic Counter-Counter Measures
EEE - Electromagnetic Environmental Effects
EFIM - Electric Field Intensity Meter
EFM - Electric Field Meter
EFPS - Electric Field Point Source
EFS - Electric Field Strength
EHF - Extremely High Frequency
EIA - Electronic Industries Association
EIRP - Effective Isotropically Radiated Power
ELF - Extremely Low Frequency
ELINT - ELectronic-signals INTelligence
EMBS - Engineering in Medicine and Biology Society of IEEE
EMC - Electromagnetic Compatibility
EMCCD - Electron Multiplying Charged Coupled Device
EMCS - Electromagnetic Compatibility Society of IEEE
EMD - Electromagnetic Disturbance
EME - Electromagnetic Emissions or Electromagnetic Environment
emf - Electromotive Force
EMF - Electromagnetic Field
EMI - Electromagnetic Interference
EMP - Electromagnetic Pulse
EMR - Electromagnetic Radiation
EMV - Electromagnetic Vulnerability
EMWS - Electromagnetic Warning System
EPA - Environmental Protection Agency
EPM - Electronic Protective Measures
EPRI - Electrical Power Research Institute
ERP - Effective Radiated Power
ESD - Electrostatic Discharge
ESFK - Electrostatically Focused Klystron
ESM - Electronic Support Measures
EUT - Equipment Under Test
EUTELSAT - European Telecommunications Satellite Organization
EWS - Electronic Warning System
F - Force
F - Farad
FAA - Federal Aviation Administration
FCC - Federal Communications Commission
FCCorp - Federal Consultants Corporation
FDA - Food and Drug Administration
FDA - Frequency Domain Analysis
FDFD - Frequency Domain Finite Differences
FDMA - Frequency Division Multiple Access
FDR - Frequency Domain Reflectometry
FDTD - Finite Difference Time Domain
FEDCON - Federal Consultant
FET - Field Effect Transistor
FFT - Fast Fourier Transform
FHSS - Frequency Hopping Spread Spectrum
FIM - Field Intensity Meter
FIR - Far InfraRed
FLIR - Forward Looking Infrared
FM - Frequency Modulation
FS - Field Strength
FSK - Frequency Shift Keying
FTE - Fraction of Time Exposure
FWHM - Full Width Half Maximum
G - Conductance
GEO - Geostationary Earth Orbit
GFE - Government Furnished Equipment
Gi - Gilbert
GLONASS - Global Navigation Satellite System (RUS)
GMDSS - Global Maritime Distress and Safety System
GMF - Gyromagnetic Frequency
GNSS - Global Navigation Satellite System (US)
GPS - Global Positioning System
GROL - General Radio Operators License
GSO - GeoStationary Orbit
H - Magnetic Field Strength
H - Henry
HDTV - High Definition Television
HEMP - High-altitude Electromagnetic Pulse
HEMT - High Electron Mobility Transistor
HERF - Hazards of Electromagnetic Radiation to Fuel
HERO - Hazards of Electromagnetic Radiation to Ordnance
HERP - Hazards of Electromagnetic Radiation to Personnel
HF - High Frequency
HPBW - Half Power Beam Width
HPEM - High Power Electromagnetic(s)
HPM - High Power Microwave
HST - Harmonic Signal Threshold
HST - Hubble Space Telescope
Hz - Hertz (formally, cycles per second)
I - Current
IBW - Impulse Band Width
ICCD - Intensified Charged Coupled Device
IDFT - Inverse Discrete Fourier Transform
IEC - International Electrotechnical Commission
IEEE - Institute of Electrical and Electronics Engineers
IEMI - Intentional Electromagnetic Interference
IEMP - Internal Electromagnetic Pulse
IEO - Intermediate Earth Orbit
IF - Intermediate Frequency
IFF - Identification Friend or Foe
IFFT - Inverse Fast Fourier Transform
IGFET - Insulated Gate Field Effect Transistor
IGS - International GNSS Service (formally, International GPS Service)
IIS - Intentional Interference Surveillance
ILS - Instrument Landing System
IMD - Intermodulation Distortion
IMI - Inter-Modulation Interference
IMP - Inter-Modulation Products
IMS - Instrumentation and Measurement Society of IEEE
INMARSAT - International Maritime Satellite Organization
IMSO - International Mobile Satellite Organization
INTELSAT - International Telecommunications Satellite Organization
IPS - Ionized Point Source
IR - Infrared
IRAC - Interdepartment Radio Advisory Committee
ISAR - Inverse Synthetic Aperture Radar
ISO - International Standards Organization
ISS - Internationl Space Station
ITFS - Instructional Television Fixed Service
ITSO - International Telecommunications Satellite Organization
ITU - International Telecommunication Union
J - Current Density
J - Joule
JJ - Josephson Junction
JFET - Junction Field Effect Transistor
JPALS - Joint Precision Approach and Landing System
JPL - Jet Propulsion Laboratory
JSC - Joint Spectrum Center
JTIDS - Joint Tactical Information Distribution System
L - Inductance
LA - Linear Accelerator
LA - Linear Amplifier
LAAS - Local Area Augmentation Service
LADAR - LAser Detection And Ranging
LAN - Local Area Network
LASER - Light Amplification by Stimulated Emission of Radiation
LCI - Line Conducted Interference
LCP - Left Circular Polarization
LEO - Low Earth Orbit
LEP - Left Elliptical Polarization
LF - Low Frequency
LIDAR - LIght Detection And Ranging
LISN - Line Impedance Stabilization Network
LO - Local Oscillator
LPDA - Log Periodic Dipole Array
LPTV - Low Power Television
LWIR - Long Wavelength InfraRed
M - Magnetization
MASER - Microwave Amplification by Stimulated Emission of Radiation
MASINT - Measurement and Signal INTelligence
MBK - Multiple Beam Klystron
MDS - Multipoint Distribution Service
MEO - Medium Earth Orbit
MESFET - Metal Semiconductor Field Effect Transistor
MF - Medium Frequency
MFIM - Magnetic Field Intensity Meter
MFM - Magnetic Field Meter
MFPS - Magnetic Field Point Source
MFS - Magnetic Field Strength
MILSTD - Military Standard
MLS - Microwave Landing System
MMDS - Multichannel Multipoint Distribution Service
MMF - Magnetomotive Force
MML - Mobile Measurement Laboratory
mmW - Millimeter Wave
MoM - Method of Moments
MOSFET - Metal Oxide Semiconductor Field Effect Transistor
MRI - Magnetic Resonance Imaging
MSC - Measurement Science Conference
MTI - Moving Target Indicator
MWIR - Mid Wavelength InfraRed
N - Newton
NAB - National Association of Broadcasters
NACSEM - National Communications Security Emanations Memorandum
NAFB - Newark Air Force Base
NAIC - National Astronomy and Ionospheric Center
NARTE - National Association of Radio and Telecommunications Engineers
NASA - National Aeronautics and Space Administration
NAVAIR - Naval Air Systems Command
NAVELEX - Naval Electronic Systems Command
NAVSAT - Navy Navigation Satellite System (named TRANSIT)
NAVSEA - Naval Sea Systems Command
NAVSHIPS - Naval Ship Systems Command
NBEM - Neurobioelectromagnetics
NEC - National Electrical Code
NEMP - Nuclear Electromagnetic Pulse
NIIS - Non-Intentional Interference Surveillance
NIPS - Non-ionized Point Source
NIST - National Institute of Standards and Technology
NMR - Nuclear Magnetic Resonance
NMRS - Nuclear Magnetic Resonance Spectroscopy
NRAO - National Radio Astronomy Observatory
NRL - Naval Research Laboratory
NRSC - National Radio Systems Committee
NRZ - Non-Return to Zero
NSA - National Security Agency
NSA - Normalized Site Attenuation
NTIA - National Telecommunications and Information Administration
NVLAP - National Voluntary Laboratory Accreditation Program
OATS - Open Area Test Site
OCXO - Oven Controlled Crystal Oscillator
Oe - Oersted
OIML - International Organization of Legal Metrology
OSHA - Occupational Safety and Health Administration
OTH - Over The Horizon
OTHR - Over The Horizon Radar
P - Polarization of dielectric
PAM - Pulse Amplitude Modulation
PCB - Printed Circuit Board
PCM - Pulse Code Modulation
PD - Peak Detector
PDM - Pulse Duration Modulation
PEL - Personal Exposure Limits
PET - Positron Emission Tomography
PFD - Power Flux Density
PFM - Pulse Frequency Modulation
PLL - Phase Locked Loop
PLT - Power Line Telecommunications
PM - Phase Modulation
PMEL - Precision Measurement Equipment Laboratory
POTS - Plain Old Telephone Service
ppb - parts per billion
PPH - Pulse Per Hour
ppm - parts per million
PPM - Pulse Per Minute
PPM - Pulse Position (or Phase) Modulation
PPS - Pulse Per Second
PRF - Pulse Repetition Frequency
PRR - Pulse Repetition Rate
PS - Point Source
PSK - Phase Shift Keying
PSPICE - PC version of SPICE
PTLI - Power and Transmission Line Interference
PTM - Pulse Time Modulation
PTTI - Precision Time and Time Interval
PVD - Peak Voltage Detector
PWM - Pulse Width Modulation
Q - Charge
Q - Figure of Merit
QAM - Quadrature Amplitude Modulation
QPD - Quasi-Peak Detector
QPVD - Quasi Peak Voltage Detector
QWIP - Quantum Well Infrared Photodetector
R - Resistance
RADAR - RAdio Detection And Ranging
RADINT - RADar INTelligence
Rb - Rubidium
RC - Remote Controlled
RC - Resonant Cavity
RCP - Right Circular Polarization
RCS - Radar Cross Section
RCVR - Receiver
RE - Radiated Emissions
REP - Right Elliptical Polarization
RFI - Radio Freqency Interference
RFID - Radio Frequency IDentification
RI - Radiated Immunity
RMS - Root Mean Square
ROI - Region Of Interest
RPS - Resonant Point Source
RS - Radiated Susceptibility
RSc - Radio Science
RSFQ - Rapid Single Flux Quantum
RTCA - Radio Technical Committee for Aeronautics
S - Poynting Vector
SA - Spectrum Analyzer
SA - Selective Availability
SAE - Society of Automotive Engineers
SAR - Specific Absorption Rate
SAR - Synthetic Aperture Radar
SCAM - Superconducting CAMera
sCMOS - Scientific Complementary Metal Oxide Semiconductor
SD - Standard Deviation
SDAC - Solar Data Analysis Center
SDO - Solar Dynamics Observatory
SDR - Software Defined Radio
SDSA - Software Defined Spectrum Analyzer
SE - Shielding Effectiveness
SEC - Space Environmental Center
SETI - Search for ExtraTerrestrial Intelligence
SG - Signal Generator
SGEMP - System Generated Electromagnetic Pulse
SHF - Super High Frequency
SIGINT - SIGnal INTelligence
SINAD - Signal Noise And Distortion
SLA - Signal Logging and Analysis
SLAC - Stanford Linear Accelerator Center
SLF - Super Low Frequency
SMPTE - Society of Motion Picture and Television Engineers
SNR - Signal to Noise Ratio
SPICE - Simulation Program for Integrated Circuits Emphasis
SPS - Signal Point Source
SQUID - Superconducting QUantum Interference Device
SSM - Spread Spectrum Modulation
SSMA - Spread Spectrum Multiple Access
STDs - Superconducting Tunnel Detectors
SWPC - Space Weather Prediction Center
SWR - Standing Wave Ratio
SWIR - Short Wavelength InfraRed
T - Tesla
TACAN - TACtical Air Navigation
TAEL - The Analytical Electronics Laboratory
TAF - Transmit Antenna Factor
TAI - International Atomic Time
TCAS - Traffic alert and Collision Avoidance System
TCXO - Temperature Compensated Crystal Oscillator
TDA - Time Domain Analysis
TDM - Time Division Multiplexing
TDMA - Time Division Multiple Access
TDR - Time Domain Reflectometry
TDWR - Terminal Doppler Weather Radar
TEM - Transverse Electromagnetic Mode
TG - Tracking Generator
THD - Total Harmonic Distortion
THSS - Time Hopping Spread Spectrum
THz - Terahertz
THzW - TeraHertz Wave
TLV - Threshold Limit Values
TMTR - Transmitter
TOI - Third Order Intercept
TR - Transmit-Receive
TSCM - Technical Surveillance Counter Measures
TWT - Traveling Wave Tube
TWTA - Traveling Wave Tube Amplifier
U - Uncertainty
UHF - Ultra High Frequency
UL - Underwriters Laboratory
ULF - Ultra Low Frequency
URSI - Union Radio Scientifique Internationale
USNO - United States Naval Observatory
UTC - Universal Time Coordinated
UTD - Uniform Theory of Diffraction
UV - Ultraviolet
V - Volt
VCXO - Voltage Controlled Crystal Oscillator
VF - Voice Frequency
VHF - Very High Frequency
VIA - Vector Impedance Analysis
VLA - Very Large Array
VLBA - Very Long Baseline Array
VLBI - Very Long Baseline Interferometry
VLF - Very Low Frequency
VLWIR - Very Long Wavelength InfraRed
VNA - Vector Network Analyzer
VOA - Voice of America
VoIP - Voice over Internet Protocol
VOR - VHF Omnidirectional Range
VSWR - Voltage Standing Wave Ratio
W - Watts
WAAS - Wide Area Augmentation Service
WAN - Wide Area Network
Wb - Weber
WiFi - Wireless Fidelity
WiMAX - Worldwide Interoperability for Microwave Access
WLAN - Wireless Local Area Network
X - Reactance
XO - Crystal Oscillator
XTAL - Crystal
Y - Admittance
YAG - Yttrium Aluminum Garnet
YIG - Yttrium Iron Garnet
Z - Impedance