Etymology
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trey (n.)

late 14c., "card, die, or domino with three spots," from Anglo-French, Old French treis (Modern French trois), oblique case of treie "three," from Latin tria (neuter) "three" (see three). In slang use for "three (of anything)" from 1887.

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Definitions of trey

trey (n.)
the cardinal number that is the sum of one and one and one;
Synonyms: three / " / iii / trio / threesome / tierce / leash / troika / triad / trine / trinity / ternary / ternion / triplet / tercet / terzetto / deuce-ace
trey (n.)
one of four playing cards in a deck having three pips;
Synonyms: three
From wordnet.princeton.edu