English abbreviations from first to fisint
- FIRST ((observing program) Faint Images of the Radio Sky at Twenty-centimeters, a radio survey of the sky with the Very Large Array)
- FIS (Fuze Interface System)
- FISA (Fédération Internationale des Sociétés d'Aviron (French, "International Federation of Rowing Associations"))
- FIS-B (Flight information services – broadcast)
- FISC (Fleet and Industrial Supply Center)
- FISH (Fighting In Someone's House (UK) (Colloquial. Slang term for FIBUA))
- Fishway (Fish ladder)
- FISINT (Foreign Instrumentation Signals Intelligence)