- (abbreviation) . (Canada) Newfoundland and Labrador, a Canadian province.
- (abbreviation) . (slang) , Not Frat; denoting things counter to the culture of Greek life, particularly in the Southern United States.
- (initialism) . (US) National Formulary, is a book of public pharmacopeial standards.
- (initialism) . (US, aviation) Prefix code for NASA research fighter plane designations.