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:
“Every sect is a moral check on its neighbour. Competition is as wholesome in religion as in commerce.”
—Walter Savage Landor (1775–1864)