E East
E Espionage
EADASS Engineering and Administrative Data AcquiSition System
EAFB Edwards Air Force Base (Espacial)
EAN Certainly part of an X.400 Address in Europe
EARN European Academic Research Network
EAS Extended Area Service (ou Engenharia de adminstração de Sistemas) 
EASI European Academic Supercomputer Initiative (da IBM
EBCDIC Extended Binary Coded Decimal Interchange Code
EC Exchange Carrier (Telefonia)
ECAFE Economic Commission for Africa and the Far East
ECASS Electronically Controlled Automatic Switching System
ECASS Export Control Automated Support System
ECC Error Correction Code
ECC Error Correction Code (corretor de erros em memória ou transmissão)
ECCM Electronic Counter-CounterMeasures
ECDO Electronic Community Dial Office
ECG ElectroCardioGram
ECL Emitter Coupled Logic (veja também TTL)
ECLSS Environmental Control and Life Support System (Espacial)
ECM Electronic Counter Measure
ECM European Common Market
ECMA European Computer Manufacturers Association
ECO Ecological
ECO Electronic Central Office
ECO Engineering Change Order
ECPA Electronic Communications Privacy Act (lei americana)
ECS Environmental Control System (Espacial)
ECT ElectroConvulsive Therapy
ECV Electric Cargo Vehicle [NASA OEXP]
ED&D Expert Dungeons & Dragons
EDGAR Electronic Data Gathering, Analysis, and Retrieval
EDI Electronic Data Interchange
EDIF Electronic Design Interchange Format
EDO Extended Duration Orbiter (Espacial)
EDP Electronic Data Processing
EDS Electronic Data Systems
EDT Eastern Daylight Time
EDTA Ethylene Diamine Tetraacetic Acid
EDTCC Electronic Data Transmission Communications Central
EE Electrical Engineer
EE Electrical or Electronics Engineer
EEC European Economic Community
EEC European Economic Comunity
EEG ElectroEncephaloGram
EEL Epsilon Extension Language
E&EO Errors and Omissions Excepted
EEPROM Electrically Erasable Programmable Read Only Memory
EFF Electronic Frontier Foundation
e.g. ??? (Latin(?): por exemplo)
EGA Enhanced Graphics Adapter
EGP Exterior Gateway Protocol [Internet]
EGRET Energetic Gamma Ray Experiment Telescope (em GRO) (Espacial)
EHF Extremely High Frequency (30-300GHz)
EIA Electronic Industries Association
EINE EINE Is Not Emacs
EISA Extended Industry-Standard Architecture
EISS European Intelligence Support System
EKG ElectroKardioGramm (veja também ECG)
EL ElectroLuminescent (como em display)
ELF Extremely Low Frequency
ELO Electric Light Orchestra
ELP Emerson, Lake and Palmer (or Powell)
ELV Expendable Launch Vehicle (Espacial)
E&M ``Ear and Mouth''; receive and transmit leads of a signalling system
EM Enlisted Man (veja também EW)
EMA Electronic Mail Association
EMACS Editor MACroS
EMACS Eight Megabytes And Constantly Swapping
E-MAIL Electronic MAIL
EMF ElectroMotive Force
EMF ElectroMotive Force (voltage)
EMI ElectroMagnetic Interference
EMP Electromagnetic Pulse
EMPRESS EnvironMental Pulse Radiation Environment Simulator for Ships
EMR ElectroMagetic Response
EMR ElectroMagnetic Response
EMS Electronic Message System
EMS Extended Memory Specification
EMT Emergency Medical Technician
EMU ElectroMagnetic Unit
EMU Extravehicular Mobility Unit (Espacial)
ENIAC Electronic Numerical Integrator and Calculator
ENS ENSign
EO End Office (Telefonia)
EO Erasable Optical
EOF End Of File
EOM End Of Month
EOS Earth Observing System (Espacial)
EOWG Engineering and Operations Working Group (abaixo de FNC)
EP Experience Points
EP Extended Play
EPA Environmental Protection Agency
EPOS Engineering and Project-management Oriented Support system
EPRI Electric Power Research Institute
EPROM Erasable Programmable Read Only Memory
EPS Encapsulated PostScript
EPT Empire of the Petal Throne
EQ Educational Quotient (veja também IQ)
ER Emergency Room
ERA Earned Run Average
ERA Entity-Relationship-Attribute
ERA Equal Rights Amendment
ERD Entity-Relation Diagram
ERE Entity Relationship Editor
ERT Earth Resources Technology (Espacial)
ES Expert System
ESA European Space Agency
ESA European Space Agency (Espacial)
ESAC Electronic Systems Assistance Center
ESDI Enhanced Standard Device Interface
ESE East South East
ESF Extended Superframe Format (Telefonia)
ESM Electronic Support Measures
ESnet Energy Sciences network (DoE) (Networking)
ESO European Southern Observatory
ESO European Southern Observatory (Espacial)
ESP Extra Sensory Perception
ESPS Entropic Signal Processing System
ESS Electronic Switching System (Telefonia)
ESSEX Experimental Solid State EXchange
EST Eastern Standard Time
ET Eastern Time
ET Extra Terrestrial (Espacial)
ET (Shuttle) External Tank (Espacial)
ETA Estimated Time of Arrival
ET/ACC External Tank/Aft Cargo Carrier (veja também ET) (Espacial)
ETC Et cetera, and so on...
ETD Estimated Time of Departure
ETFD Electronic Toll Fraud Device (Telefonia)
ETH Eidgn\:oessiche Technische Hochschule (Swiss Federal Institute of Technology)
ETLA Extended Three Letter Acronym (Espacial)
ETO Earth-to-Orbit (Espacial)
ETR Eastern Test Range (Espacial)
ETS Electronic Translator System
ETV Education TeleVision
EUUG European Unix User Group
EUV Extreme UltraViolet
EUV Extreme UltraViolet (Espacial)
EUVE Extreme UltraViolet Explorer (Espacial)
EVA ExtraVehicular Activity
EVA ExtraVehicular Activity (Espacial)
EVX Electronic Voice eXchange
EW Electronic Warfare
EW Enlisted Woman (veja também EM)
EWOS European Workshop for Open Systems
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