Uniform number (Major League Baseball)
In baseball, the uniform number is a number worn on the uniform of each player and coach. Numbers are used for the purpose of easily identifying each person on the field as no two people from the same team can wear the same number. Although designed for identification purposes only, numbers have become the source of superstition, emotional attachment, and honor. In Major League Baseball, player and manager numbers are always located on the back of the jersey. A smaller number is often found on the front of the jersey, while umpires wear their numbers on the uniform shirt sleeve.
Adrián Beltré wore uniform number 29 while playing for the Texas Rangers. His number was later retired by the team.
Players on the Cleveland Indians wearing uniforms with numbers on their left sleeves in 1916. The Indians were the first team to introduce numbered uniforms in the major leagues.
Ian Kinsler (3) and Tyler Collins (18) sporting numbers on the front of their road jerseys while playing for the Detroit Tigers in 2015
Players' equipment and accessories often also include their uniform numbers, as seen on Ross Detwiler's glove.
Jackie Robinson Day is a traditional event which occurs annually on April 15 in Major League Baseball (MLB), commemorating and honoring the day Jackie Robinson made his major league debut. Celebrated at MLB ballparks, on that one day, all players, coaches, and managers on both teams, and the umpires, wear Robinson's uniform number, 42. April 15 was Opening Day in 1947, Robinson's first season in the major leagues.
Robinson in 1954
Robinson's number displayed at Citi Field
Robinson in 1954
Jackie Robinson Rotunda at Citi Field
