In MLB, every team has retired the same number. What number is it, who played with it, and why was it retired throughout MLB?

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Normally the individual clubs are responsible for retiring numbers. On April 15, 1997, Major League Baseball took the unusual move of retiring a number for all teams. On the 50th anniversary of Jackie Robinson's breaking the major league color barrier, his number 42 was retired throughout the majors, at the order of Commissioner Bud Selig. This meant that no future player on any major league team could wear number 42, although players wearing #42 at the time were allowed to continue with it. http://en.wikipedia.org/wiki/List_of_Major_League_Baseball_retired_numbers May 28 10, 10:38 PM