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:
“Unless you become more watchful in your states and check the spirit of monopoly and thirst for exclusive privileges you will in the end find that ... the control over your dearest interests has passed into the hands of these corporations.”
—Andrew Jackson (1767–1845)