(mathematics) The real number system adjoined with two extra symbols: ∞ and −∞, inheriting the ordering of the real number system, and defining −∞ to be less than any real number, and ∞ to be larger than any real number.

Capable of being numbered or counted.

plural of Froude number

(fluid mechanics) A dimensionless number defined as the ratio of a characteristic velocity to a gravitational wave velocity, used in fluid mechanics to determine the resistance of an object moving through water.

The act of juggling a large number of props as opposed to a smaller number of props with longer and/or more varied patterns.

plural of purely imaginary number

plural of chromatic number

(combination puzzles, chiefly Rubik's Cube) The maximum number of moves needed to solve a puzzle using God's algorithm.

plural of triangular number

plural of harmonic number