Billiard Cue
A Billiard Cue is the white ball that is used to strike other balls in the game of Pool. They are most often white in color with no marks on the ball. A cue ball is needed for every game of pool or billiards.
Coin-operated pool tables such as those found at bars and college campuses historically have often used either a larger or denser Billiard Cue ball. This is because its extra weight makes it easy for the cue ball return mechanism to separate it from object balls. Object Balls are captured until the game ends and the table is paid again for another game.
This means the Billiard Cue ball can be returned for further play, should it be accidentally pocketed. Rarely in the US, some pool tables use a smaller cue ball instead. Modern tables usually employ a magnetic ball of regulation or near-regulation size and weight, since players have rightly complained for many decades that the heavy and often over-sized cue balls do not play correctly.