Either of the digits 0 or 1 when used in the pure binary numeration system. [ref ISO 2382-4

A single digit number in base 2 (therefore 0 or 1). The smallest unit for computerized data. See also byte, kilobyte, megabyte.

The smallest entity of digital information possible.

A number that uses a base 2 number system rather than a decimal (or base 10) number system.

Most modern computers use the binary counting system -- employing only 1's and 0's -- to represent any number or other character. Binary numbers can be easily stored in electronic form. See also Central Processor.