English abbreviations from fiv to fl
- FIV (flow-induced vibration)
- FIW (French and Indian War)
- FIWC (Fleet Information Warfare Center)
- FIX (Financial Information Exchange)
- FIXe (Navigational Fix Error)
- FIZ (Fitzroy Crossing Airport)
- fj (Fijian language (ISO 639-1 code))
- FJD (Fiji dollar (ISO 4217 currency code))
- FJI (Fiji (ISO 3166 trigram))
- FJJ (Famous Jett Jackson)
- FJN (Financial Job Network)
- FJR (Fujairah International Airport (cargo only))
- fK (Femtokelvin)
- FKA (Full Knowledge Architecture)
- f.k.a. or F/K/A (Formerly Known As)
- FKB (Baden Airpark (Karlsruhe/Baden-Baden Airport))
- FKDM (Fort Knox Supplemental Material)
- FKGT (Fernseh- und Kinotechnischen Gesellschaft)
- FKI (Bangoka International Airport)
- FKJ (Fukui Airport)
- FKL (Venango Regional Airport (Chess Lamberton Field))
- FKM (Fakultas Kesehatan Masyarakat)
- FKN (Franklin Municipal Airport (John Beverly Rose Field))
- FKP (Falkland Islands pound (ISO 4217 currency code))
- FKQ (Fak Fak Airport)
- FKS (Fukushima Airport)
- FKSM (Fort Knox Supplemental Manual)
- FKTC (Federasiwn Karate Traddodiadol Cymru (Welsh Traditional Karate Federation))
- fl (floruit (Latin, "living") (genealogy))