A referee technical decision (RTD) is a term used in boxing

Boxing

Boxing, also called pugilism, is a combat sport in which two people fight each other using their fists. Boxing is supervised by a referee over a series of between one to three minute intervals called rounds...

 when a fight ends because a fighter refuses to continue (or a fighter's corner refuses to allow the fighter to continue).

One of the most famous referee technical decisions occurred in the Sonny Liston vs. Cassius Clay fight on February 25, 1964, in Miami Beach, Florida

Miami Beach, Florida

Miami Beach is a coastal resort city in Miami-Dade County, Florida, United States, incorporated on March 26, 1915. The municipality is located on a barrier island between the Atlantic Ocean and Biscayne Bay, the latter which separates the Beach from Miami city proper...

, the first of their two fights. After six back and forth rounds, Sonny Liston

Sonny Liston

Charles L. "Sonny" Liston was a professional boxer and ex-convict known for his toughness, punching power, and intimidating appearance who became world heavyweight champion in 1962 by knocking out Floyd Patterson in the first round...

, complaining of a shoulder injury, refused to get up from his stool for the seventh round. The fight went to Cassius Clay

Muhammad Ali

Muhammad Ali is an American former professional boxer, philanthropist and social activist...

 who, as a result, became the World Heavyweight Champion.