The Yankees introduced uniform numbers on their jerseys in 1929. Originally, the numbers indicated the player's spot in the batting order, i. e. Ruth #3, Gehrig #4, etc., but that changed when other teams started to give player's numbers so that the fans could identify them by referring to the scorecards sold at the stadiums.
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As of 2010, the Yankees are winners of 27 World Series titles.
February
The 1916 Cleveland Indians were the first team to wear numbers on their jerseys. The rest of the owners in baseball didn't like that idea and Cleveland quickly abandoned the jersey numbers. It wasn't until 1929 that they came back, when the New York Yankees started putting numbers on the back of the jersey. By 1931, the American League ruled that all team should put numbers on jerseys and in 1932 the National League followed suit.
Mariano Rivera made his Yankees debut in 1995.