A number used to confirm an individual's identity, e.g. when using an ATM or a mobile phone, or when making payment using a credit card or debit card.

(mathematics, algebraic number theory) A field which includes the rational numbers and has finite dimension as a vector space over the rational numbers.

(mathematics) An element of the two-dimensional algebra over the field of real numbers which contains an element ȷ ≠ 1 satisfying ȷ² = 1.

plural of number 2 pencil

(roguelikes, humorous) The pseudorandom number generator used by a roguelike game's engine.

azimuthal quantum number

(idiomatic) To provide sufficient people to make an event worthwhile.

plural of personal identification number

plural of number-theoretic function

(mathematics) a real or complex valued function of n defined on the set of natural numbers that expresses some arithmetical property of n.