The arena buzzer became a fixture of professional basketball after the NBA introduced the 24-second shot clock in 1954, giving every possession a hard, audible deadline. A loud horn was needed to be heard over crowds, and television broadcasts made that blast familiar far beyond the arena. As NBA highlights moved to YouTube, TikTok and sports video games, the sound was clipped and reused outside live games. It remains popular because almost any viewer instantly links it to time expiring, pressure moments and a play being stopped dead.