Bottle pool, also known as bottle-billiards and bottle pocket billiards, is a hybrid billiards game combining aspects of both carom billiards and pocket billiards. Played on a standard pool table, the game uses just two , a cue ball, and a 6¾ inch (171 mm) tall, narrow-necked bottle called a or tally bottle, traditionally made from leather, that is placed on the table and used as a target for . Those unfamiliar with the game sometimes mistakenly use its name as a synonym for the very different game of kelly pool. Bottle pool has been described as combining "elements of billiards, straight pool and chess under a set of rules that lavishly rewards strategic shot making and punishes mistakes with Sisyphean point reversals."