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:
“Is there no hope for me? Is there no way
That I may sight and check that speeding bark
Which out of sight and sound is passing, passing?”
—Paul Laurence Dunbar (1872–1906)