List of retired numbers in association football - Wikipedia

List of Real Madrid CF players - Wikipedia

Ole Miss Rebels football - Wikipedia

I was researching team statistics on PFR and noticed they added Brady's jersey to the retired numbers list, although it hasn't been officially announced yet? : r/Patriots

Uniform number (American football) - Wikipedia

List of Green Bay Packers retired numbers, American Football Database

Indiana Hoosiers football - Wikipedia

Cardiff City F.C. - Wikipedia