| Abbreviation | Definition |
|---|---|
| FET | Field Effect Transistor |
| FET | Flight Elapsed Time |
| FEU | Flight Equivalent Unit |
| FEW | Federally Employed Women |
| FEWG | Flight Evaluation Working Group |
| FF | Flight Forward |
| FF | Flip Flop |
| FF | Free Flight |
| FFA | First Free Ascent |
| FFAR | Folding-Fin Aerial Rocket |
| FFBD | Functional Flow Block Diagram |
| FFC | Final Flight Certification |
| FFD | Fixed Format Display |
| FFD | Functional Flow Diagram |
| FFF | Fast Forward Flight |
| FFM | Free-Flying Module |
| FFP | Firm Fixed Price |
| FFTO | Free-Flying TeleOperator |
| FGE | Fine Guidance Electronics |
| FGS | Fine Guidance Sensor |