FL
- fl – (p) floruit (Latin, "living") (genealogy)
- fL – (s) Femtolitre
- FL – (s) Florida (postal symbol)
- FLA – (p) Florida – (i) Front Line Assembly – Future Large Aircraft
- FLAB – (p) Four-letter abbreviation
- FLAC – (a/i) Free Lossless Audio Codec
- FLAC – (a/i) Free Legal Advice Centres
- FLAK – (p) FLugAbwehrKanone (German for "Anti-Aircraft Guns")
- FLB – (i) Forward Logistics Base
- FLET – (a/i) Forward Line of Enemy Troops
- FLIP – (p) Flight Information Publication
- FLIR – (i) Forward Looking InfraRed (sensor)
- FLK – (s) Falkland Islands (ISO 3166 trigram)
- Also Funny-Looking Kid, a medical initialism for a young child with a mostly normal but somewhat unusual ("funny") appearance that raises the suspicion index for congenital disorder. Used only before a medical diagnosis has determined the cause of the unusual appearance.
- FLOT – (a/i) Forward Line of Own Troops
- FLSA – (i) Fair Labor Standards Act
- FLQ – (i) Front de libération du Québec (French for "Québec Liberation Front")
- FLQ – (a) Free Legal Questions
- FLTSAT – (p) Fleet Satellite
- FLTSATCOM – (p) Fleet Satellite Communication System
- FLUBOS – (a) Fat, Lazy, Useless, Bag Of Shit
Read more about this topic: List Of Acronyms And Initialisms: F