| Abbreviation | Definition |
|---|---|
| FBWA | First Byte of Word Access |
| FC | File Compare |
| FC | Fix Command |
| FC | Flag Complex |
| FC | Function Code |
| FCB | Form Constant Byte |
| FCC | Form Constant Character |
| FCC | Form Constant Characters |
| FD | Float Double |
| FDAI | Fire Door Assembly Inspector |
| FDB | Form Double Byte |
| FEMMA | Foldable Electronic Memory Module Assembly |
| FERA | Forms Eject and Run Away |
| FESA | Floating Evaporative Self assembly |
| FESA | Front End Sub Assembly |
| FHS | Find Hidden Service |
| FICAS | Fully Integrated Carbody Assembly System |
| FIOA | Fetch Instruction Operand Address |
| FITT | File In The Trash |
| FJA | Frangible Joint Assembly |