Check Digits
A check digit is a form of redundancy check used for error detection, the decimal equivalent of a binary checksum. It consists of a single digit computed from the other digits in the message.
Read more about this topic: International Standard Book Number
Famous quotes containing the word check:
“Experience was to be taken as showing that one might get a five-pound note as one got a light for a cigarette; but one had to check the friendly impulse to ask for it in the same way.”
—Henry James (1843–1916)