/co/ fanart of Princess Luna, prior to her first cameo appearance in "Friendship is Magic, Part 2".

/co/ is a board from 4chan.

Some consider it the origin of the term 'brony' as well as the fandom as a whole. Bronies who come from /co/ were often refered to as /co/lts - the counterpart of the later appearing /b/rony threads.

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