Football Referee Positions (What Letters & Numbers Mean) – vIQtory Sports
What do the letters stand for on the back of football referees' shirts? - Quora
Why do college football referees have an 'S' on their uniform? - Quora
How is the color of a referee's uniform defined, in soccer matches, when they aren't wearing all black? - Quora
What do the letters stand for on the back of football referees' shirts? - Quora
What does the number on the back of the shirt of all sport players signify? - Quora
Why do college football referees have an 'S' on their uniform? - Quora
What determines when players have their names on the back of the team jersey? - Quora
Why do college football referees have an 'S' on their uniform? - Quora