Nine-ball (disambiguation)

Nine-ball (or nine-ball, 9 ball, 9-ball and other variant spellings) is a pool (pocket billiards) game, played with nine object balls, of which the 9 ball is the game-winning ball. It may also refer to:


 * 9 ball, the pool (pocket billiards) ball numbered "9", and colored with a yellow stripe
 * 9-ball, a nine-dimensional n-ball in mathematics