The term 'Gridiron Zebra' is a slang term used to refer to a REFEREE in American football. The crossword solutions for this term are REF (3 letters) and REFEREE (7 letters). A REFEREE is an official who is responsible for enforcing the rules of the game and making sure that the players abide by them. They also have the authority to make decisions on the field, such as calling penalties or awarding points. The term 'Gridiron Zebra' is derived from the black and white striped uniforms that referees wear during games.