What is "seven-ball"

Seven-ball is a contemporary pool game with rules similar to nine-ball, though it differs in two key ways: the game uses only seven as implied by its name, and play is restricted to particular pockets of the table. William D. Clayton is credited with the game's invention in the early 1980s.

Seven-ball (or sevenball, 7 ball, 7-ball and other variant spellings) may refer to:

• 7 ball, the pool (pocket billiards) ball numbered "7", and traditionally brown or maroon, but tan in some ball sets
• 7 ball, the black snooker ball, worth 7 points, normally referred to as "the black"
• Seven-ball, a pool (pocket billiards) game, played with seven object balls, of which the 7 ball is the game-winning ball
• 7-Ball, the United States Army 101st Airborne Division Band Barbershop Quartet, whose logo features a pool 7 ball (see above)
• 7-ball, a seven-dimensional -ball in mathematics
• Seven Balls, a Grade-II-listed pub at Kenton Lane, Harrow Weald, London, dating to ca. the 17th century