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.
Learn more about routing numbers, account numbers and check numbers below. The first set of numbers on the lower left corner of a check is the routing number. Keep in mind the routing numbers are 9-digit codes and the character symbol surrounding the numbers is not part of the routing number on a check. Routing numbers, sometimes called transit numbers, are public and may vary based on the region where you opened your account.