FNDM

English Wikipedia has an article on:

RWBY

Etymology

From fandom. The spelling in capital letters is based on the characters' practice of using the first letters of their names for their teams, like "RWBY" and "JNPR".

Pronunciation

IPA^(key): /ˈfændəm/

Proper noun

FNDM

(Internet slang, fandom slang) the fans of the American online animated series RWBY.