FO
See also: Appendix:Variations of "fo"
Translingual
Symbol
FO
- The ISO 3166-1 two-letter (alpha-2) code for the Faroe Islands.
- (logic, computer science) First-order logic.
English
Noun
FO (plural FOs)
- (aviation) first officer (copilot)
Interjection
FO
- (Internet slang, text messaging, vulgar) Initialism of fuck off.