Trey \Trey\, n. [OF. treis three, F. trois, L. tres. See Three, and cf. Tray-trip.]

Three, at cards, dice, or dominoes; a card, die, or domino of three spots or pips.

Seven is my chance and thine is cinq and trey. --Chaucer.

Source: Webster's Revised Unabridged Dictionary (1913)