What do the following shirts have in common west ham number 6 man city's and Chelsea's number 25?

The shirts worn by West Ham's number 6, Manchester City's number 25, and Chelsea's number 25 all represent key player positions within their respective teams. Specifically, West Ham's number 6 is typically associated with a central defender, while the number 25 shirts at City and Chelsea may also belong to important players in defensive or midfield roles. Additionally, they reflect each club's unique squad numbering system and the significance of these numbers to the team's identity.