| e-GIF | e-Government Interoperability Framework |
| E1 | 2,048 Mb/s |
| E3 | 34,368 Mb/s |
| EAI | Enterprise Application Integration |
| EAM | Electro-Absorption Modulator |
| EAROM | Electrically Alterable Read-Only Memory |
| EASE | Equipment And Software Emulator |
| E-BEAM | Electron Beam |
| EBCDIC | Extended Binary Coded Decimal Interchange Code |
| EBHT | Electron Beam High Throughput lithography |
| EBIC | Electron-Beam-Induced Current |
| EBP | Electron Beam Pumping |
| EBR | Edge Bead Removal |
| EBSP | Electron Backscattering Pattern |
| EBU | European Broadcasting Union |
| EC | Engineering Change; Equipment Controller |
| ECAD | Electronic Computer-Aided Design; Engineering Computer-Aided Design |
| ECAE | Electronic Computer-Aided Engineering |
| ECCB | Electronic Components Certification Board |
| ECG | Electro CardioGram |
| ECL | Emitter Coupled Logic |
| ECM | Electronic Counter-Measures |
| ECN | Engineering Change Notice |
| ECO | Engineering Change Order |
| ECP | Electron Channeling Pattern |
| ECQB | ElectrocChemical Quartz crystal Balance |
| ECR | Electron Cyclotron Resonance; Engineering Change Request; Equivalent Circuit Rate |
| ECW | Enhanced Compressed Wavelet |
| ED | ElectroDeposited |
| EDA | Electronic Design Automation |
| EDAX | Energy-Dispersive Analysis of X-rays (TM name for EDS) |
| EDD | Earliest Due Date |
| EDEPR | Electrically Detected EPR |
| EDENDOR | Electrically Detected ENDOR |
| EDFA | Erbium-Doped Fibre Amplifier |
| EDGE | Enhanced Data rates for GSM Evolution |
| EDI | Electronic Data Interchange |
| EDIF | Electronic Design Interchange Format |
| EDL | Electric Double Layer; Edit Decision List |
| EDM | Electronic Design Machining |
| EDO | Extended Data Out |
| EDO-RAM | Extended Data Output RAM |
| EDP | Electron Diffraction Pattern; Ethylene Diamine Pyrocatechol; Electronic Data Processing |
| EDS | Energy-Dispersive (X-ray) Spectroscopy (aka EDX & EDAX) |
| EDTV | Enhanced Definition TV |
| EDU | Equipment Dependent Uptime |
| EDX | Energy-Dispersive X-ray analysis (aka EDAX and EDS) |
| EDXA | Energy-Dispersive X-ray Analysis |
| EEDF | Electron Energy Distribution Function |
| EEL | Edge Emitting Laser |
| EELS | Electron Energy Loss Spectroscopy |
| EEPLD | Electrically Erasable Programmable Logic Device |
| EEPROM | Electrically Erasable Programmable Read Only Memory |
| EFG | Electric Field Gradient |
| EFO | Electronic Flame-Off |
| EFOCS | Evanescent Fiber Optic Chemical Sensors |
| EFTIR | Emission Fourier Transform InfraRed spectroscopy |
| EFTIR | Emission Fourier Transform InfraRed spectroscopy |
| EFV | Excess Flow Valve |
| EGE | Ethylene Glycol Ethers |
| EHD | Electro-Hydro-Dynamic |
| EHF | Extremely High Frequency |
| EHO | Estimated Hourly Output |
| EHP | Electron-Hole Plasma; Electron-Hole Pair |
| EHS | Extremely Hazardous Substances |
| EHV | Extra High Voltage |
| EI | Equipment Integration |
| EIA | Electronic Industries Association |
| EID | Equipment Interface Development |
| EIP | Equipment Improvement Program; Equipment Improvement Project |
| EIS | Electrochemical Impedance Spectroscopy; Engineering Information System |
| EJB | Enterprise Java Beans |
| EKF | Extended Kalman filter |
| EKMS | Electronic Key Management System |
| EL | Experience Level |
| ELF | Extremely Low Frequency |
| ELFEXT | Equal Level Far End Crosstalk |
| ELIC | Extended Line Card Interface Controller |
| ELNES | Energy-Loss Near Edge Structure |
| ELOG | Epitaxially Laterally Overgrown Gallium (nitride on sapphire) |
| ELS | Electron Energy Loss Spectroscopy |
| EM | Electron Microscopy; Enterprise Model; ElectroMagnetic; ElectroMigration |
| EMA | Easy Magnetization Axis |
| EMC | ElectroMagnetic Capability; ElectroMagnetic Compatibility |
| EMEMS | Elastomeric MEM System |
| EMF | ElectroMagnetic Field; Windows enhanced metafile image format; ElectroMotive Force |
| EMG | ElectroMiGration |
| EMI | ElectroMagnetic Interference |
| EMILM | Electro-absorbtive Modulated Isolated Laser Module |
| EMMA | Electron Microscopy and MicroAnalysis |
| EMO | EMergency Off |
| EMP | ElectroMagnetic Pulse |
| EMPF | Electronics Manufacturing Productivity Facility |
| EMR | Enter Move Request |
| EMT | Effective Mass Theory |
| EMU | ElectroMagnetic Unit |
| ENDOR | Electron Nuclear DOuble Resonance |
| EOC | Elastic Optic Coefficient |
| EOL | End Of Life; End Of Line |
| EOM | Equations Of Motion |
| EORM | Environmental and Occupational Risk Management |
| EOS | Electrical OverStress |
| EOT | End Of Transfer |
| EOY | End Of year |
| EP | Extreme Pressure; ElectroPolish |
| EPA | Environmental Protection Agency |
| EPD | Etch Pit Density |
| EPG | Electronic Program Guide |
| EPIC | Extended Peripheral Interface Circuit |
| EPL | Electron Projection Lithography |
| EPLD | Electrically Programmable Logic Device |
| EPMA | Electron-Probe MicroAnalysis |
| EPO | Emergency Power Off |
| EPR | Electron Paramagnetic Resonance; Ethylene-propylene (Copolymer) Resin |
| EPROM | Electrically Programmable Read-Only Memory |
| EPS | Encapsulated PostScript image format |
| EPS | Encapsulated PostScript image format |
| EPSS | Electronic Performance Support System |
| EPT | Equipment Performance Tracking; Ethylene-Propylene Terepolymer |
| EQUIPC/I | EQUIPment Control and Integration |
| EQUIPRTC | EQUIPment Real-Time Control |
| Er | Erbium |
| ERA | Electrically Reconfigurable Arrays |
| ERAM | Equipment Reliability, Availability, and Maintainability |
| ERC | Equivalent Release Concentration |
| ERD | Elastic Recoil Detection |
| ERDA | Elastic Recoil Detection Analysis |
| ERFC | Complementary error function |
| eRFP | Electronic Request For Proposal |
| ERG | Enhancement and Review Group |
| ERM | Enterprise Reference Model; Evaporation Rate Monitoring |
| ERN | External Recurrent Neural network |
| ERP | Extended Range Pyrometer; Enterprise Resource Planning |
| ERS | Event Reporting Standard |
| ERT | Emergency Response Time |
| Es | Einsteinium |
| ES | Engineering Specification; Expert System; Efros and Schlovskii |
| ESC | ElectroStatic Chuck; Enhanced Speech Circuit |
| ESCA | Electron Spectroscopy for Chemical Analysis |
| ESCC | Enhanced Serial Communication Controller |
| ESD | Electron-Stimulated Desorption; Electro Static Discharge |
| ESDIAD | Electron-Stimulated Desorption Ion Angular Distribution |
| ESE | Electron Spin Echo |
| ESH | Environment, Safety, and Health |
| ESI | Electron Spectroscopic Imaging; Early Supplier Involvement |
| ESM | Electronic Service Manual |
| ESR | Electron Spin Resonance; Equivalent Series Resistance |
| ETAB | Executive Technical Advisory Board |
| ETC | Enhanced Throughput Cellular |
| ETPC | Electrolytic Tough-Pitch Copper |
| ETQR | External Total Quality and Reliability |
| ETS | Excited Triplet State |
| ETSI | European Telecommunications Standards Institute |
| Eu | Europium |
| EUV | Extreme UltraViolet |
| eV | ElectronVolt |
| EVC | Equilibrium Vapor Concentration |
| EventML | Event Mark-up Language |
| EVM | Error Vector Magnitude |
| EW | Electronic Warfare |
| EWMA | Exponentially Weighted Moving Average |
| exa | 1.00E+18 (symbolized by E) |
| EXAFS | Extended X-ray Absorption Fine Structure |
| EXELFS | Extended Energy-Loss Fine Structure |