English abbreviations from fish to fit
- FISH (Fighting In Someone's House (UK) (Colloquial. Slang term for FIBUA))
- Fishway (Fish ladder)
- FISINT (Foreign Instrumentation Signals Intelligence)
- FISO (Force Integration Staff Officer)
- FISS (Foreign Intelligence and Security Services)
- FIST (Future Integrated Soldier Technology (UK), Fire Support Team (US))
- FIST-DMD (FIST Digital Message Device)
- FISTV (Fire Support Team Vehicle (US))
- FIT (fairing intervention tool)