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In basketball, a double is the accumulation of a double-digit number total in one of five statistical categories—points, rebounds, assists, steals, and blocked shots—in a game. Multiple players usually score double-digit points in any given basketball game; the double nomenclature is usually reserved for when a player has double-digit totals in more than one category.
A double-double is the accumulation of a double-digit number total in two of the statistical five categories in a game. The most common double-double combination is points-rebounds, followed by points-assists. Since the 1983–84 season, Tim Duncan leads the National Basketball Association (NBA) in the points-rebounds combination with 840, and John Stockton leads the points-assists combination with 714.
A triple-double is the accumulation of a double-digit number total in three of the five categories in a game. The most common way to achieve a triple-double is through points, rebounds, and assists. Oscar Robertson leads the all-time NBA list with 181 career triple-doubles and is, with Russell Westbrook, one of only two players ever to average a triple-double for a season. Westbrook currently holds the record for most triple-doubles in a season with 42 and is the only person to average a triple-double for two consecutive seasons.
A quadruple-double is the accumulation of a double-digit number total in four of the five categories in a game. This has occurred four times in the NBA.
A quintuple-double is the accumulation of a double-digit number total in all five categories in a game. Two quintuple-doubles have been recorded at the high school level, by Tamika Catchings and Aimee Oertner, but none have occurred in a college or professional game. A similar accomplishment is the five-by-five, which is the accumulation of at least five points, five rebounds, five assists, five steals, and five blocks in a game. In the NBA, only Hakeem Olajuwon and Andrei Kirilenko have accumulated multiple five-by-fives since the 1984–85 season.

Source: Wikipedia