A unique number assigned by IANA to identify objects that are defined by an enterprise.

(idiomatic) A numbers game: the use of inappropriate statistics (numbers) to reflect a desired result (usually misleading). / plural of number game: lotteries, numbers games.

(genetics) The variation of the number of copies (normally two) of a gene, or of sequences of DNA, in the genome of a specific individual; has been linked to some diseases

The number (street address) assigned to a particular house to distinguish it from other buildings on the same street.

(computing) Any computing application that requires large amounts of numerical calculation.

(genetics) The normal variation in the number of copies (normally two) of a gene, or of sequences of DNA, in the genome of a specific individual

(photography) The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens.

(mathematics) A number describing the degree of collaboration between a mathematician and Paul Erdős, defined such that a mathematician who has written a paper with Erdős has an Erdős number of 1, a mathematician who has written a paper with somebody having an Erdős number of 1 has an Erdős number of two, and so on.

A number allocated to a syllable in various transliteration systems such as Hanyu Pinyin indicating the tone in which it is pronounced.

A telephone number dialled by mistake, for example by transposing digits. / A telephone call received from an unfamiliar caller, due to a mistake in the number dialled.