Definition of "NF"

(Canada) Initialism of Newfoundland and Labrador, a Canadian province.  examples

(US, pharmacology) Initialism of National Formulary, a book of public pharmacopeial standards.

(slang) Initialism of not frat, denoting things counter to the culture of Greek life, particularly in the Southern United States

(US, aviation) Prefix code for NASA research fighter plane designations.  examples

(pathology) Initialism of necrotizing fasciitis.

(pathology) Initialism of neurofibromatosis.

(Unicode) Initialism of normalization form.  examples