In the case of baseball, for example, the rules for choosing the back number of a baseball jersey may vary from team to team and game to game, but there are generally some basic customs and rules that are followed. Here are some common baseball jersey back number selection rules:

1. Basic Rules

1. Uniqueness:In a team, the back number at the same time is special and belongs to a specific person, and each player has a unique back number to avoid confusion.

2. Inheritance:Some teams will hang up the back numbers of their past star players for future generations to look up to, and later players may avoid using these retired back numbers when choosing back numbers.

Second, the habit of the pitcher and the batter's back number

1. Pitcher:

• Main starting pitcher: Generally 11, 18, 19.

• Main Rescue Pitcher: Generally No. 22.

• Left pitcher: Generally 28, 34, 47.

2. Hitter:

• No. 1 and No. 3: Generally strong sticks.

• No. 7: Generally reserved for stealers.

• No. 27: Generally the team's main catcher.

3. The rules for the back number of a particular competition

1. Japanese High School Baseball Game:

• Baseball No. 1: Pitcher.

• Baseball No. 2: Catcher.

• Baseball No. 3: First baseman.

• Baseball No. 4: Second baseman.

• Baseball No. 5: Third baseman.

• Baseball 6: Shortstop.

• Baseball No. 7: Left fielder.

• Baseball No. 8: Outfielder.

• Baseball No. 9: Right fielder.

2. MLB (Major League Baseball):

• The number 42 was included by the Dodgers as a retirement number in honor of Jackie Robinson, the No. 1 non-white player in the major leagues, and later became the common retirement number of all teams, but on Jackie Robinson Day every year, the number 42 is worn by all players on both sides.

• Players can choose a number 60 or higher, which was less common in the past but is now becoming more and more accepted.

4. Individuality and freedom

As a younger generation of players enters the league, they tend to break the mold and freely choose the numbers that mean most to them. Some even have nicknames and emojis printed on the back of their jerseys to show their freedom and right to express their individuality.

5. Handling of special numbers

Some teams will lock some numbers with special meanings, such as 0, 1 (which symbolizes ace or leader in some cultures), 99 (sometimes reserved for coaches or special roles), etc., and do not release them for ordinary players. These regulations may vary from team to team.

The rules for choosing the back number of a baseball jersey include both traditional customs and rules, as well as the individuality and freedom of the players. When choosing a back number, players need to consider factors such as the team's history, traditions, personal preferences, and the rules of the game.