Mathematics and Physics
- Billiard, the long-scale name used in most European languages (chiefly French, Spanish, German and Dutch) for the number 1015 in mathematics (called "quadrillion" in the short scale generally used in English).
- 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).
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- A dynamical billiard, any of several systems of particle trajectories within a closed reflective boundary.
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