| Abbreviation | Definition |
|---|---|
| FEEPS | Field Effect Electric Propulsion Subsystem |
| FEG | Field Emission Gun |
| FEG | Flying Electric Generator |
| FEHI | FORMULA ELECTRIC AND HYBRID ITALY |
| FEI | Frequency Electronics Inc |
| FEIP | Fast Ethernet Interface Processor |
| FEL | Fedora Electronic Lab |
| FEL | Fedora's Electronic Lab |
| FEL | Free Electron Laser |
| FEM | Finite Element Modelling |
| FEM | Front Electronic Module |
| FEMMA | Foldable Electronic Memory Module Assembly |
| FENCE | Fuel Emitters Navigation Communications Electronic |
| FEOL | Front End Of Line |
| FEP | Fluorinated Ethylene-Propylene (Teflon) |
| FEPC | Federation of Electric Power Companies |
| FES | Front Electric Sustainer |
| FES | Functional Electric Stimulation |
| FET | Field Effect Transistor |
| FETM | Future Electronics Technology Mixer |