sweet sixteen

Short definition from Wiktionary

Noun

1. 1
   A girl's sixteenth birthday, or sixteenth-birthday party and a related coming of age party.
2. 2
   Sixteen.

Proper noun

1. 1
   The sixteen teams participating in the regional semifinals of the NCAA Division I tournament, one of whom will become the national champion.
2. 2
   The round of the NCAA Division I basketball tournament where all but 16 teams have been eliminated.
3. 3
   An appearance in the Sweet Sixteen.