Billiard or billiards may refer to:
* A Cuegloss|Billiard|billiard, a type of shot in cue sports "(see below)"
Cue sportsin general, including pool, carom billiards, snooker, etc. The term "billiards" by itself is also sometimes used to refer to any of the following more specifically::* Carom billiards(also known as French billiards) games in general (a chiefly non-British usage, in the North America, the British Commonwealth, etc.):* The specific game of English billiards(a chiefly British usage):* Pocket billiards(pool) games (such as eight-ball and nine-ball) in general (a chiefly colloquial American usage)
* "Billiard", the (chiefly French) long-scale name for the number 1015 in mathematics (called "quadrillion" in short scale)
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", below)":* A dynamical billiard, any of several "systems" of particle trajectories within a closed reflective boundary
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
* Electric billiards, an obscure term for
pinball(from the French "billard électrique", who today call pinball "flipper", a borrowing from English)
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