| Abbreviation | Definition |
|---|---|
| FMS | Forms Management System |
| FMVP | Framework Member Validation Project |
| FN | Frequency and Number |
| FNB | Flexible Narrow Beam |
| FNB | Frequency - Narrow Band |
| FNBA | Flexible Narrow Beam Adapter |
| FND | Flat Numeric Display |
| FNN | Feed-forward Neural Network |
| FOB | Frequency Operated Button |
| FOBE | Fractional Out of Band Energy |
| FOC | Fan-Out Control |
| FOCS | Fiber Optic Chemical Sensor |
| FODMS | Fiber Optic Digital Multiplex System |
| FOG | Fiber Optic Gyroscopes |
| FOLCS | Fiber Optic Low Cost System |
| FOLZ | First-Order Laue Zone |
| FOM | Filter Oscillator Mixer |
| FOMP | First Order Magnetization Process |
| FOP | Forced Output Power |
| FOUP | Front Opening Unified Pod |