What does it mean when a ball club retires the number utilized by a player?
It means he had an illustrious career with a particular team for an extended period of time.
Therefore, the number worn will never be used again by the respective club in recognition of the players career.
As a result of the mentioned factors, the San Diego Padres have retired five numbers. Plus the mandatory number retired throughout baseball, worn by the legendary Jackie Robinson (42).

The breakdown…
- Jackie Robinson (42).