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| E | Elevation | |
| e- | prefixed to almost any word to make it appear electronic and exciting. | |
| EADS | European Aeronautics Defence and Space Company | |
| EAFAS | European Academy for Aviation Safety | |
| EAX | Electronic Automatic Exchange | |
| EBCDIC | Extended Binary Coded decimal Interchange Code | |
| EBT | Extended Back Track | |
| ECASS | Electronically-Controlled Automatic Switching System | |
| ECC | Error Correction Code | |
| ECCM | Electronic Counter Countermeasures | |
| ECM | Electronic Countermeasures | |
| ECP | Emergency Conning Position | |
| ECR | Engineering Change Requirement | |
| ECW | Equivalent Constant Word | |
| ED | Electrodynamic | |
| EDC | Error Detection and Correction | |
| EDGE | Electronic Data-Gathering Equipment | |
| EDI | Electronic Data Interchange | |
| EDM | Electronic Data Management | |
| EDP | Electronic Data Processing | |
| EDP | Electronic Data Processing | |
| EDS | Electrostatic Discharge Sensitive | |
| EDSAC | Electronic Delayed-Storage Automatic Computer | |
| EDVAC | Electronic Discrete Variable Automatic Computer | |
| EEA | Electronic Engineers Association | |
| EED | Electrically Initiated Explosive Device | |
| EEF | Engineering Employment Federation | |
| EEPROM | Electrically Erasable Programmable Read Only Memory | |
| EF | Embarked Forces | |
| EFC | Emergency Fire Control/Escort Force Commander | |
| EFW | Effect Fallout Wind | |
| EHF | Extremely High Frequency | |
| EHP | Effective Horsepower | |
| EHT | Extra High Tension | |
| EIA | Electronic Industries Association (US) | |
| EJ | Escort Jammer | |
| EKD | Electronic Key Distribution | |
| ELA | Enable Lock Angle | |
| Elev | Elevation | |
| ELF | Extremely Low Frequency | |
| ELI | Embodiment Loan Item | |
| ELL | Engineering Learning Link | |
| Eln | Elevation | |
| ELOS | Extended Line of Site | |
| ELOS | Extended Line of Sight | |
| ELR | Enable Lock Range | |
| ELT | Electrometer | |
| EM | Electromagnetic Log | |
| EM | Electro-Magnetic | |
| EM Log | Electro-Magnetic Log | |
| EM/DIS | Embarkation/Disembarkation | |
| EMAR | Experimental Memory Address Register | |
| EMC | Electromagnetic Compatibility | |
| EMCON | Emission Control | |
| Emerg | Emergency | |
| EMI | Electro-magnetic interface | |
| EMP | Electromagnetic Pulse | |
| EMSEC | Emission Security | |
| EMTA | Engineering and Marine Training Organisation | |
| ENCAST | European Network for Challenges in Advanced Semiconductor Technologies | |
| END | Enhanced Network Driver | |
| Eng | Engage/Engagement | |
| Eng | Engage | |
| ENI | Equivalent Noise Input | |
| ENIAC | Electronic Numeral Integrator and Calculator | |
| Env | Environment | |
| EO | Electro-Optical | |
| EOF | End Of File | |
| EOF | End of File Marker | |
| EOI | End of Information | |
| EOL | End of Life | |
| EOR | Emergency Operations Room | |
| EOS | Electro Optical System | |
| EOT | End of Tape | |
| EOV | End of Volume | |
| EOW | Engineering Order Wire | |
| EP | Estimated Position/Emission Policy | |
| EPI | Elevation-Position Indicator | |
| EPIC | Electronic Plotting Equipment | |
| EPLD | Electrically Programmable Logic Device | |
| EPROM | Erasable Programmable Read Only Memory | |
| EPSRC | Engineering and Physical Sciences Research Council | |
| Eqpt | Equipment | |
| ERA | Electronic Reading Automation | |
| ERCS | Electronic Countermeasures-Resistant Communication System | |
| ERD | SW | Entity Relationship Diagram |
| ERD | Encoded Restructuring Description | |
| ERDA | Energy Research and Development Agency | |
| ERP | EffectiveIEquivalent Radiated Power | |
| ERP | Enterprise Resource Planning | |
| ES | Electro-Static | |
| ESA | European Space Agency | |
| ESD | Electro Static Discharge | |
| ESDI | Electronic System Data Interface | |
| ESF | European Social Fund | |
| ESG | Electronic Sweep Generator | |
| ESM | Electronic Surveillance Measures/Electronic Support Measures | |
| ESP | Emergency Steering Position | |
| Est | Estimate | |
| ESW | Excellence South West | |
| ETAP | Estimated Time of Arrival/Departure | |
| ETI | Exhaust Trial Indicator | |
| ETL | Extended Track Label | |
| ETN | ESM System Track Number | |
| EUROCAE | European Organisation for Civil Aviation Equipment | |
| EW | Electronic Warfare | |
| E-W | East West | |
| EWC | Electronic Warfare Controller/Co-ordinator | |
| EWCP | Electronic Warfare Control Processor | |
| EWD | Electronic Warfare Director | |
| EWIO | Electronic Warfare/Intelligence Office | |
| EWO | Electronic Warfare Officer | |
| Ex | Exercise | |
| Exch | Exchange | |
| Ext | External | |
| F | Friendly/Frequency Band | |
| F/P | Foot Push | |
| FAA | Federal Aviation Authority | |
| FAAWC | Force Anti-Air Warfare Co-Ordinator | |
| FAC | Forward Air Controller | |
| FACP | Forward Air Control Party | |
| FACT | Fully-Automatic Compiling Technique | |
| FAE | Field Application Engineer | |
| FAM | Friendly Air Movement | |
| FAQ | Frequently Asked Questions | |
| FAR | Federal Aviation Regulations | |
| FAR | Federal Acquisition Regulations | |
| FASVWC | Force Anti-Surface Vessel Warfare Co-Ordinator | |
| FASWC | Force Anti-Submarine Warfare Co-Ordinator | |
| FAT | SW | File Allocation Table |
| FAT | SW | Factory Acceptance Test |
| FAX | Facsimile | |
| FBC | Fully-Buffered Channel | |
| FBNW | For But Not With | |
| FBW | Fly By Wire | |
| FC | Fire Control | |
| FCBGA | Flip Chip Ball Grid Array | |
| FCC | Fleet Command Centre | |
| FCC | Federal Communications Commission | |
| FCDT | Fire Control Delay Time | |
| FCM | Frequency Controlled Modulation | |
| FCOMMS | Force Communications | |
| FCPO(CM) | Fleet Chief Petty Officer (Missile) | |
| FCPO(CY) | Fleet Chief Petty Officer (Communications Yeoman) | |
| FCPO(EW) | Fleet Chief Petty Officer (Electronic Warfare) | |
| FCPO(R) | Fleet Chief Petty Officer (Radar) | |
| FCPO(RS) | Fleet Chief Petty Officer (Radio Supervisor) | |
| FCPO(S) | Fleet Chief Petty Officer (Sonar) | |
| FCS | Fire Control System Radar/Future Command Systems | |
| FCS | Frame Check Sequence | |
| FD | Functional Documentation/Design | |
| FDDI | Fiber Distributed Data Interface | |
| FDM | Frequency Division Multiplex | |
| FDO | Flight Deck Officer | |
| FDR | Flight Data Recorder | |
| FE | Functional Evaluation | |
| FEI | Federation of the Electronics Industry | |
| FEP | Financial Evaluation Programme | |
| FET | Field Effect Transistor | |
| FEZ | Fighter Engagement Zone | |
| F-F | Flip-Flop | |
| FFF | Fission Fussion Fission Bomb | |
| FFT | Fast Fourier Transform | |
| FFT | First Feasible Firing Time/Fast Fourier Transform | |
| FIFO | First In First Out | |
| FII | Final Installation Inspection | |
| FIU | Fault Indication Unit | |
| FLIR | Forward Looking Infra Red | |
| FLOPS | - Floating-point Operations Per Second | |
| FLYPRO | Flying Programme | |
| FM | Frequency Modulated | |
| FMECA | Failure Modes Effects and Criticality Analysis | |
| FMI | Flow Measurement and Indication | |
| Fmt | Format | |
| FOB | Forward Officer Bombardment | |
| FOC | Furthest on Circle/First of Class | |
| FOC | Free of Charge | |
| FOCAS | Flag Officer Carriers & Amphibious Ships | |
| FOM | Film Original Master | |
| FOR | Force Operations Room | |
| FOSM | Flag Officer Submarines | |
| FOTI | Fleet Operating & Tactical Instructions | |
| FOTS | Fibre-Optics Transmission System | |
| FP | Foot Push/Flame-Proof Equipment/Feedback of Performance | |
| FPB | Fast Patrol Boat | |
| FPGA | Field Programmable Gate Array | |
| FPR | Flag Planning Room | |
| fps | Feet per Second | |
| FPU | Floating Point Unit | |
| FR | Fast Release/Field Resistance/Friendly Tracks | |
| FR (Key) | Friendly Tracks Key | |
| FRED | Figure Reading Electronic Device | |
| Freq | Frequency | |
| FRPP | Fire and Repair Party Facilities | |
| FRTP | Force Recognised Tactical Picture | |
| FSD | Full-scale Deflection | |
| FSK | Frequency Shift Key | |
| FSSC | First Salvo Safety Correction | |
| FSSSC | Force Surface & Sub-surface Surveillance | |
| FSTA | Future Strategic Tanker Aircraft | |
| FTA | Fault Tree Analysis | |
| FTC | Fast Time Constant | |
| FTN | Force Track Number | |
| FTP | SW | File Transfer Protocol |
| FW | Fixed Wing | |
| Fwd | Forward | |
| Fx | Forecastle | |
| Fxt Pt | Fixed Point | |
| Fze | Fuze | |
| G Ref | Grid Reference | |
| GA | Gyro Angle/General Arrangement/Go-Ahead Signal | |
| GAAWC | Group Anti-Air Warfare Co-Ordinator | |
| GAMA | General Aviation Manufacturers Association | |
| GAR | Guided Aircraft Rocket | |
| GARB | Garbled | |
| GAS(V)WC | Group Anti-Surface (Vessel) Warfare Co-Ordinator | |
| GASS | Gyro Angled Snake & Search | |
| GB | Gain BadwidthIGrid Bias | |
| GC | Gun Controller | |
| GCA | Ground-Controlled Approach | |
| GCI | Ground-Controlled Interception | |
| GCL | Ground-Controlled Landing | |
| GCOMMS | Group Communications | |
| GCT | Greenwich Civil Time | |
| GCU | Gun Control Unit | |
| GD | Ground Detector | |
| GDO(V) | Gun Direction Officer (Visual) | |
| GDP | Gun Direction Platform | |
| GDSII | Graphics Display System, mark II | |
| Gen | General | |
| GENTEL | General Intelligence | |
| GEP | Grid Established Point | |
| GES | Ground Earth Station | |
| GESTE | Ground Earth Station Test Equipment | |
| GFL | Gun Flowline | |
| GHz | Gigahertz (109 Hz) | |
| GIDEP | Government Industry Data Exchange Program | |
| GIGO | Garbage In – Garbage Out | |
| GINFOF | Group Information Function | |
| GIST | General Intelligence Ship Terminal (Renamed OSCAD) | |
| GIT | Gun to Target (Line) | |
| GL(T) | Gun Laying (turret) by Radar | |
| GLOGF | Group Logistics Function | |
| GLONASS | Global Orbiting Navigation Satellite System | |
| GMT | Greenwich Mean Time | |
| GMV | Guaranteed Minimum Value | |
| GNAVF | Group Navigation Function | |
| GND | Ground | |
| GNR | Global Navigation Receiver | |
| GNSS | Global Navigation Satellite System | |
| GOE | Geostationary Earth Orbit | |
| GOP | Goal Orientated PredictionIGeneral Operations Plot | |
| GOPC | General Operations Plot Controller | |
| GOR | General Operational Requirement | |
| GOSW | Government Office South West | |
| GP | General Purpose | |
| GPAC | General Purpose Analogue Computer | |
| GPC | General Purpose Computer | |
| GPDC | General Purpose Digital Computer | |
| GPEOD | General Purpose Electro-Optic Director | |
| GPEOS | General Purpose Electro-Optical Sight | |
| GPI | Ground Position Indicator | |
| GPL | General Public License | |
| GPS | Global Positioning System | |
| GRI | Geographical Range of Interest | |
| GRU | Grid Reference Unit | |
| GS | Ground Stabilisation | |
| GSU | Gun Surface Mode | |
| GSWC | Group Surface Warfare Command | |
| GtG | Gloucester Technology Group | |
| GTRU | Gyro Compass Torpedo Relay Unit | |
| GUI | SW | Graphical User Interface |
| GUI | General User Interface | |
| GWN | Group Warfare Net | |
| GWO | Group Warfare Officer | |
| GWS | Guided Weapon System | |
| GZ | Ground-Zero | |
| h | Hour | |
| H | Height | |
| H&N | Hum & Noise | |
| H/C | Helicopter | |
| HA | Hour Angle/High Angle/Half Add | |
| HAAU | Helicopter Acoustic Analysis Unit | |
| HAG | Helicopter Action Group | |
| HALT | Highly Accelerated Life Testing | |
| HASS | Highly Accelerated Stress Screening | |
| HAST | Highly Accelerated temperature/humidity Stress Test | |
| HC | Helicopter Control/Handling Capacity | |
| HCU | Helicopter Control Unit | |
| HD | Hostile Destroyer | |
| HDDS | High-Density Data System | |
| Hdg | Heading | |
| HDLC | High-Level Data Link Control | |
| HDWS | High Definition Warning Surface | |
| HE | Hydrophone Effect | |
| HE (VT) | High Effect (Variable Time) | |
| HEALT | Helicopter Employment & Assault Landing Table | |
| Helo | Helicopter | |
| HEM | Hybrid Electromagnetic Wave | |
| HEMC | High Effect Medium Charge | |
| HEO | High Earth Orbit | |
| HERDA | Higher Education Regional Development Agency | |
| HET | High Effect Tracer | |
| Het | Supersonic Heterodyne Radio Reception | |
| HF | High Frequency | |
| HFD | Hardware Functional Documentation | |
| HFRDF | High-Frequency Repeater Distribution Frame | |
| Hgt | Height | |
| HHF | Hyper-High Frequency | |
| HICAPOM | High-Capacity Communciations | |
| HID | Helicopter Initialisation Device | |
| HIFAM | High-Fidelity Amplitude Modulation | |
| HIFR | Helicopter In-Flight Refuelling | |
| Hist | History | |
| HMS | Hull Mounted Sonar | |
| Hosp | Hospital | |
| Host | Hostility | |
| Host Thresh | Hostile Threshold | |
| HOTAS | Hands on Throttle & Stick | |
| HP | High Pass Filter/Horsepower | |
| HPI | Height Position Indicator | |
| HQ | Headquarters | |
| HR | High-Range Radar | |
| HRI | Height Range Indicator | |
| HRP | Horizontal Radiation Pattern | |
| HRT | Helicopter Radar Teacher | |
| HS | High Stability Height | |
| HSAC | High Speed Analogue Computer | |
| HSDA | High Speed Data Acquisition | |
| HT | High Tension | |
| Ht/Hgt | Height | |
| HTML | SW | Hyper Text Markup Language |
| HTOL | High Temperature Operating Life | |
| HTTP | SW | HyperText Transfer Protocol |
| HU | Helmsman Unit | |
| HUJB | Helmsman Unit Junction Box | |
| HV | High Voltage/Hard Valve | |
| HVME | Hull Vibralion Monitoring Equipment | |
| HVT | High Value Target | |
| HVU | High Value Unit | |
| HW | Half-wave Rectifier | |
| HWR2 | Hand Held Warning Receiver Mk2 | |
| HYCOTRAN | Hybrid Computer Translator | |
| Hydr | Hydraulics | |
| Hz | Hertz | |
| Top | ||