a system of signals used to represent letters or numbers in transmitting messages

convert ordinary language into code

a code (a series of characters or digits) that must be entered in some way (typed or dialed or spoken) to get the use of something (a telephone line or a computer or a local area network etc.)

a number usually of 3 digits assigned to a telephone area as in the United States and Canada

code consisting of a series of vertical bars of variable width that are scanned by a laser; printed on consumer product packages to identify the item for a computer that provides the price and registers inventory information

system using colors to designate classifications

a secret method of writing