Code

A code is a specification that describes the transformation of symbols from one set of symbols to anonther one.

For example, the ANSI code for standard character sets specifies the relation of one byte integer values to characters. The code defines that the value 66 (42h) represents the capital letter 'B'. The graphical representation of the character is not part of the ANSI codes. This belongs to another code defined by a font.

A very popular example is the Morse code. It defines the representation of characters by sequences of sound or dots and dashes respectively.