plural of 900 number

(Canada, US) A telephone number for which an extra charge is assessed, part of which is returned to the owner of the number.

plural of E number

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

(mathematics) A mathematician who specializes in number theory

plural of number theorist

(euphemistic, usually childish) Feces; the act of defecation. / (nautical, slang) A first mate. / A primary assistant; vice-leader.

(graph theory) The smallest number of colours needed to colour a given graph (i.e., to assign a colour to each vertex such that no two vertices connected by an edge have the same colour).

plural of abstract number

(mathematics) a positive integer