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.
Understanding and locating the checking routing number. 1  The first four digits of the code narrow down the geographic location of you bank in accordance with the Federal Reserve Bank it is associated with. 2  The second set of four digits identifies your specific financial institution by branch.