number three

Short definition from Wiktionary

Noun

1. 1
   The batsman who bats third.
2. 2
   A left back.
3. 3
   A player who is the backup to the two primary goalkeepers - number one and number two.
4. 4
   A small town where theatrical performances are unlikely to meet with much success.
5. 5
   The act of masturbation, especially when done in a bathroom.