it is just there jersey number... It is their jersey numbers (not there), which means that they can be identified by broadcasters in the booth and whoever is keeping the books for fouls so the ref can identify them by number.
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The numbers are chosen by the players. They may or may not mean anything. Some players choose their numbers because they like them while others choose them because they hold symbolic meanings (i.e. someone might choose the number 34 because they were selected 34th overall in the NBA Draft).
It's usually done to distinguish the players from the rest of the team.
In Football(Soccer), The numbers 1-11 we're originally for the starting 11 with the goalie taking number 1 and substitutes with higher numbers. http://en.wikipedia.org/wiki/Squad_number
The unit should be inch.
Size S M L XL XXL 3XL 4XL 5XL Jersey Size 46 48 50 52 54 56 58 60 Chest 42 46 50 54 58 62 66 70 Body Length (front) 30 31 32 33 34 35 36 37 Body Length (back) 32 33 34 35 36 37 38 39