The term NBA Official is a job title for a referee in the National Basketball Association. The three letter acronym for this job title is REF. Referees are responsible for enforcing the rules of the game and making sure that the game is played fairly. They also make decisions on fouls, violations, and other infractions. Referees must have a good understanding of the rules of the game and be able to make quick decisions in order to ensure the safety of the players and the integrity of the game.