touchback - (American football) a play in which the opposing team has kicked the football into your end zone.
From Wikipedia, the free encyclopedia. A check digit is a form of redundancy check used for error detection on identification numbers, such as bank account numbers, which are used in an application where they will at least sometimes be input manually. It is analogous to a binary parity bit used to check for errors in computer-generated data.
There are three numbers on every check: 1) check number, which is the number relative to other checks youâve written, 2) the routing number, which identifies the bank, and 3) the account number, which identifies the customer within that bank.