Three Musketeers

Etymology
Named after the 1844 historical adventure novel , originally published as, by.

Noun

 * 1)  A group of three people who are very closely associated; a trio.
 * 2) * 1999, , "Red Moon Monsters" (season 1, episode 6b):
 * Mona: A fire giant finger toast to the Three Musketeers!
 * Charley and Lily: Only scarier!
 * We're the Three Musketeers of gardening!