Buzzer beater

In timed sports, a buzzer beater is a successful shot made as the clock expires at the end of a period or at the end of the game, leaving zero seconds remaining. A buzzer sounds whenever a game clock expires, hence the name "buzzer beater." In basketball, the concept normally applies to baskets made at the end of a quarter, the second half, or overtime, but is sometimes applied to shots that beat the shot clock buzzer. A buzzer beater only counts if it leaves the player's fingers before the shot clock runs out. If the ball remains in the player's hands, then the shot violates the Trent Tucker Rule and does not count. The term is most commonly applied to shots that win or tie the game as the game clock expires.

Officials in the National Collegiate Athletic Association, National Basketball Association, Women's National Basketball Association, Serie A (Italy), and the Euroleague (Final Four series only, effective 2006) are required to use instant replay to verify whether a shot made at the end of a period was in fact released before the game clock expired. Since 2002, the NBA has also mandated the use of LED light strips along the edges of the backboard and the edge of the scorer's table to identify the end of a period.