| Abbreviation | Definition |
|---|---|
| ETS | External Tank System |
| ET-SEP | External Tank SEParation |
| ETSS | External Tank Separation Subsystem |
| ETVA | External Tank Vent Arm |
| EU | Electronic Unit |
| EU | Engineering Unit |
| EU | Experimental Unit |
| EUC | Emergency Unemployment Compensation |
| EUE | External Upset Ends |
| EUO | Emergency Use Only |
| EUROCOMSAT | EUROpean Consortium COMmunications SATellite |
| EUSC | European Union Satellite Centre |
| EUV | Extreme Ultra-Violet |
| EUVE | Extreme Ultra-Violet Explorer |
| EUVL | Extreme Ultra-Violet Lithography |
| EUVS | Extreme Ultra-Violet Spectrometer |
| EV | Electron Volts |
| EV | Expendable Vehicle |
| EV | Extra Vehicular |
| EV-2 | Earth Venture-2 |