"Names & Numbers" on clothing primarily serve for identification and personalization purposes.

Sports Jerseys: The most common use of names and numbers on clothing is seen in sports jerseys. Each player's jersey typically features their surname and a unique number. This helps in easily identifying players on the field and is also crucial for commentators and fans. For instance, in soccer, basketball, or baseball, players are known as much by their numbers as by their names.

Team Unity and Spirit: In team sports, having names and numbers on jerseys fosters a sense of unity and belonging. It's not just about identifying the players, but also about creating a team identity. This is especially important in professional sports, where team branding is crucial.

Fan Merchandise: Fans often buy jerseys with the names and numbers of their favorite players. It's a way of showing support and admiration for individual athletes or teams. These replicas are a significant part of sports merchandise sales.

Custom Apparel: Beyond sports, names and numbers can be used on custom clothing for various purposes like events, organizations, or as a fashion statement. For instance, a group attending a special event might wear shirts with names and numbers to create a unified look.

Personalization for Events or Groups: Names and numbers are not just for professional athletes. They can be used for custom clothing for events like charity runs, company teams, school sports, or group outings, adding a sense of unity and identity.

Work Uniforms: In some workplaces, especially those where safety and identification are crucial, names and numbers on uniforms help in quickly identifying employees. This is common in industries like construction, transportation, and emergency services.

Branding and Promotion: Companies sometimes use clothing with names and numbers for promotional purposes. This can be seen in event-specific branding, where staff members wear customized apparel to promote a brand or an event.

Schools and Institutions: Educational institutions often use clothing with names and numbers for their sports teams, representing the institution in inter-school competitions.

In all these uses, the addition of names and numbers to clothing adds a layer of functionality, whether it's for identification, unity, fan support, branding, or personal expression。