trey

Etymology

PIE word *tréyes From Middle English treye, from Anglo-Norman trei or treis, from Old French treis (“three”). Doublet of three.

noun

1. (card games, occasionally dice games) A playing card or die with the rank of three.
   Before you begin the Game at Picket, you must throw out of the Pack the Deuces, Treys, Fours and Fives, and play with the rest of the Cards, which are in number thirty and six. 1674, Charles Cotton, chapter 6, in The Compleat Gamester, London: R. Cutler, page 81
   He had been a pretty good guy, straight as ace-deuce-trey-four-five, till he got on the force. 1929, Dashiell Hammett, chapter 11, in Red Harvest
   You see, Sir, when I look at the Ace it reminds me that there is but one God. The deuce reminds me that the bible is divided into two parts; the Old and New Testaments. And when I see the trey I think of the Father, Son and Holy Ghost. 1948-01-01, “Deck of Cards” (track 20), in Famous Country Music Makers, performed by Tex Ritter
   Davidson had caught a trey which did not seem to improve his hand, yet he threw three dollars into the pot. 1982, Stephen King, The Man Who Would Not Shake Hands
2. (card games, dice games, dominoes) A score of three in cards, dice, or dominoes.
3. (US, Canada, basketball, informal, obsolete) A three-pointer.
4. (Australia, informal) A three penny coin; a thrippence.
5. (informal) The third bearer of the same personal name in a family, often denoted by suffixed Roman numeral III.
6. The third branch of a deer's antler.