The term 'KO Counter' refers to a REFEREE in a boxing match. The REFEREE is responsible for keeping track of the number of knockouts (KOs) that occur during the match. The three-letter abbreviation for REFEREE is 'REF' and the seven-letter abbreviation is 'REFEREE'. A REFEREE is an official who is responsible for enforcing the rules of the match and ensuring the safety of the boxers. They also have the authority to stop the match if they deem it necessary.