Uniform number (Major League Baseball)

In Major League Baseball (MLB), a uniform number is a numeral worn on the back of a player's jersey, and sometimes on the front. These numbers serve as a means of identification for players, coaches, and managers during games.

The practice of assigning uniform numbers began in the early 20th century, initially as a way for fans in the stands to more easily identify players. Numbers were originally assigned based on batting order. As the league evolved, numbers became associated with individual players and were often retained throughout their careers.

Teams generally have control over the assignment of numbers. While there are no officially mandated guidelines governing number choices, certain trends and customs have developed over time. For example, low numbers (1-9) are often assigned to infielders and catchers, while higher numbers may be given to pitchers or outfielders. However, these are simply trends and not strict rules.

Numbers can be retired by teams to honor particularly significant players in their franchise history. Once a number is retired, it is typically no longer issued to any subsequent player on that team. This is a high honor signifying the player's lasting legacy and contribution to the organization.

The use of uniform numbers has expanded beyond simple identification. Numbers are often used in marketing and merchandise, creating a direct link between players and fans. Jersey sales featuring specific numbers contribute significantly to team revenue. Furthermore, numbers have become deeply ingrained in baseball culture, evoking strong emotions and associations with specific players and moments in the sport's history.

Players sometimes have personal reasons for choosing a particular number, which can be related to family, mentors, or significant dates. These personal connections add another layer of meaning to the numbers worn on the field. While the specific meaning behind each number can vary, their presence is an integral part of the MLB experience.