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.
Routing Number (USA) The routing number is a nine-digit numerical code used in the United States to identify a specific financial institution, and it is used for domestic transfers. You can easily find it at the bottom of your checks. The format of the Routing Number code is like this: AAAA BBBB C. AAAA is the Federal Reserve Routing Symbol;