(mathematics) Any symbol (in particular × or · or *) used to denote the operation of multiplication.

(arithmetic) The symbol + used to denote the operation of addition, to indicate that a number is positive, and so on.

(arithmetic) The symbol −, used to denote the operation of subtraction or to indicate that a number is negative.

The symbol £, representing the pound sterling. / (US) The symbol # on a telephone / (US) The symbol #, denoting weight in pounds.

(countable) One of several natural languages, typically used by the deaf, in which words consist of hand shapes, motions, positions, and facial expressions.

(computing) The convention by which one bit in the representation of a number indicates the numeric sign, while the rest indicate the magnitude.

(computing) The bit in the representation of a number indicating whether it is negative or positive; applicable to both twos complement and signed magnitude representations.

The symbol '/' used in the United Kingdom before decimalisation to separate shillings from pence when writing out sums of money. (Examples: 7/6 = seven shillings and six pence; 7/- = seven shillings exactly.)

The hash or number sign (#).

(computing) The character # used to represent the word number; the hash sign; also called the pound sign in the US