| Abbreviation | Definition |
|---|---|
| FREIDA | Fellowship and Residency Electronic Interactive Database Access |
| FRK | Fast Response type K thermocouple |
| FRMB | Fast Ramp Mini Batch |
| FRNC | Flame Retardant Non Corrosive |
| FROG | Frequency Regulation Of Generator |
| FROG | Frequency Resolved Optical Gating |
| FRP | Fixed Reception Pattern |
| FRR | False Rejection Rate |
| FRU | Field Replacable Unit |
| FSA | Finite State Automation |
| FSAA | Four Sample Anti-Aliasing |
| FSCM | Federal Supply Code for Manufacturers |
| FSD | Full Scale Deflection |
| FSDU | Frequency Standard Distribution Unit |
| FSE | Field Scanned ENDOR (Electron Nuclear Double Resonance) |
| FSG | Fluorinated Silicate Glass |
| FSK | Frequency Shift Keying |
| FSM | Finite State Machine |
| FSMO | File Server Management Organization |
| FSO | Full-Scale Output |