Definitions for "Check Character"
The check character, if used, is the way the symbol ensures that its data has been correctly encoded and read. Since many codes are self-checking, the check character is not required by many symbologies, although it is an option in most of them.
A character included in a message for the purpose of performing a mathematical check to ensure the accuracy of the message.
A character used to check the integrity of the preceding bar code symbol. A check character is normally found at the end of the data encoded within the bar code.