Jisho

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Noun
1. number on player's back
Wikipedia definition
2. Number (sports)In team sports, the number, often referred to as the uniform number, squad number, jersey number, shirt number, sweater number, or similar (with such naming differences varying by sport and region) is the number worn on a player's uniform, to identify and distinguish each player (and sometimes others, such as coaches and officials) from others wearing the same or similar uniforms. The number is typically displayed on the rear of the jersey, often accompanied by the surname.
Read “Number (sports)” on English Wikipedia
Read “背番号” on Japanese Wikipedia
Read “Number (sports)” on DBpedia

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