Billiard or billiards (as a noun, adjective or verb) may refer to:

• A billiard, a type of shot in cue sports (such as pool, carom billiards and snooker)
• A dynamical billiard, any of several systems of particle trajectories within a closed reflective boundary, in theoretical physics (contrast this count noun with the mass noun "dynamical billiards", below)
• Billiard, the (chiefly French) long-scale name for the number 10¹⁵ in mathematics (called "quadrillion" in short scale)

Billiards (as a noun or adjective) may refer to:

• Cue sports in general, including pool, carom billiards, snooker, etc. TemplateCuegloss will have to be hacked to support multi-page articles A billiard is a Dynamical system in which a particle alternates between motion in a straight line and Specular reflections off of a boundary Names of numbers larger than a quadrillion are almost never used for reasons discussed further below

• Carom billiards (also known as French billiards) games in general (a chiefly non-British usage, in the US, the British Commonwealth, etc. Carom billiards, sometimes called carambole billiards or simply carambole and in some cases used as a synonym for the game of straight rail from , but rarely in England itself)
• The specific game of English billiards (a chiefly British usage)
• Pocket billiards (pool) games (such as eight-ball, nine-ball and snooker) in general (a chiefly colloquial American usage)
• Italian billiards or five-pins
• Russian billiards or Russian pyramid
• Artistic billiards

• Dynamical billiards, the mathematical theory of particle trajectories within a closed reflective boundary, in theoretical physics (contrast this mass noun with the count noun "dynamical billiard", above)
• Nicolas billiards, an obscure French board game invented in 1895, and of no relation to the games above (see its French article for an illustration)
• Indian (or Nepalese) finger billiards, the board game better known as carrom. English billiards, called simply billiards in many former British colonies and in Great Britain where it originated also known variously as the English game Pocket billiards, most commonly referred to as pool, is the general term for a family of games played on a specific class of Billiards table, having 6 receptacles Five-pins ( Italian cinque birilli) also known as stecca (in Italian five-pin billiards, 5-pins, Artistic billiards, sometimes called fantasy billiards or fantaisie classique, is a Carom billiards discipline in which players compete at performing 76 A billiard is a Dynamical system in which a particle alternates between motion in a straight line and Specular reflections off of a boundary Carrom or carroms is a family of Tabletop games sharing a similarity in that their mechanics lie somewhere between Billiards and Table shuffleboard
• Electric billiards, and obscure term for pinball (from the French billard électrique, who today call pinball flipper, a borrowing from English)

Pinball is a type of coin-operated Arcade game where a player attempts to score points by manipulating one or more Metal balls on a playfield inside a Glass

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