trey

Short definition from Wiktionary

Noun

1. 1
   A playing card or die with the rank of three.
2. 2
   A score of three in cards, dice, or dominoes.
3. 3
   A three-pointer.
4. 4
   A three penny coin; a thrippence.
5. 5
   The third bearer of the same personal name in a family, often denoted by suffixed Roman numeral III.
6. 6
   The third branch of a deer's antler.

Proper noun

1. 1
   A nickname for someone who is the third person in the family sharing his father's name.
2. 2
   A male given name from English of modern usage, derived from the nickname.