See also: Appendix:Variations of "an" English Noun A/N (fandom slang) author's note; a note appended to a work of fan fiction by its author, typically containing acknowledgments, background information, or content warnings. Anagrams n.a., NA, -na, N/A, N.A., n/a, Na, na Wikiwand - on Seamless Wikipedia browsing. On steroids.