| Abbreviation | Definition |
|---|---|
| FAB | Fast Atom Bombardment |
| FAC | File Access Code |
| FACET | Fault Assisted Circuits for Electronic Training |
| FACT | Fairchild Advanced CMOS Technology |
| FACTS | Flexible Alternating Current Transmission System |
| FADEC | Full Authority Digital Electronic Controllers |
| FADEC | Full Authority Digital Electronics Control |
| FAM | Frequency Amplitude Modulated |
| FAR | Failure Analysis Report |
| FASER | Feedback Assessment Submission electronic repository |
| FASTER | Fully Automatic Screen Trading and Electronic Registration |
| FAX | Facsimile Automatic Xerox |
| FB | Filter Bank |
| FB | Fine Blanking |
| FB | Free to Bound (process) |
| FBAC | Flatness-Based Adaptive Control |
| FBB | Forward-Body Bias |
| FBD | Forward Biased Diod |
| FBDO | Full Band Duplex Offset |
| FBJ | Forward biased diod |