411 REFERENCE · Wiktionary
F/O
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
Appendix:Variations of "fo"
English
Noun
en fandom slang en fictional other
en aviation en first officer.
en military aviation en flying officer.
en P/O F/L
Anagrams
en fo OF OF. Of- of