| Abbreviation | Definition |
|---|---|
| FRF | First Reduction File |
| FRO | Fido Read Only |
| FS | Fairchild Semiconductor |
| FS | Field Separator |
| FS | File Separator |
| FS | File System |
| FSA | Finite State Automata |
| FSA | Finite State Automaton |
| FSB | File Selection Box |
| FSC | Fujitsu Siemens Computer |
| FSE | Forward Symbolic Execution |
| FSF | Fast Search Forward |
| FSF | File Skip Forward |
| FSF | File System Forward |
| FSF | Forward Skip File |
| FSF | Free Software Foundation |
| FSI | File Set Index |
| FSM | Font Scaling Manager |
| FSM | Free Software Movement |
| FSO | File System Object |