in some sports, such as baseball, basketball, and american football, a player's jersey may be "retired". when a jersey is retired that player's jersey is placed usually where the team plays in honour of that player's accomplishment. the retiring of a jersey at one time included the retiring of the number on the player's jersey leaving it unavailable for future players, to further honour that player. however, as jerseys are usually double digit (00-99), that leaves only 100 possible numbers—if the rules of the sport allow it. for example, in u.s. college basketball, only 36 distinct numbers are possible, as rules prohibit the use of any digits greater than 5. as such the practice of retiring the number has dwindled, and in most cases only the specific jersey is retired and put on display.