BilliardBilliard shaped pipes: One of the most common styles, this pipe has a round and tall bowl even in proportion with the shank. It simply has a straight part called the shank, with the bowl mounted at a right angle (technically, it is not exactly 90 degrees; if it were, it would look wrong). The shank is extended by the part that is held in the mouth, called the "bit" or mouthpiece. This shape developed out of machine turning and probably owes its name to the straight cue used in the game of billiards. It can be made in all sizes, from miniature to giants.