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.
Find out why. A routing number is a unique 9-digit number assigned to a bank or credit union. The routing number on a check is found at the bottom of your check, which also includes your account number. That string of numbers at the bottom of your check is really important. Find out why.