It is worn by Ronaldo.
7 per team
Cristiano Ronaldo used to be #9 but changed to #7 with Real Madrid.
7 to 11 depending on what league you are playing in
7 a side
$1,000,000.00 a game if they score more than 7 goals
There are 11 players in a Colledge or University team. There might be 7 for younger players.