In UAEJJF competitions one competitor will always wear a red belt, with spectators wondering why. 

The red belt is used so referees and scorekeepers can communicate to each other which athlete will receive points during a match. 

Regardless of the color gi an athlete wears, one will always wear a red belt in addition to his given rank. 

The referee signals when a competitor with the red belt scores by raising his right hand, which are then registered on the scoreboard in the red square next to his name.