e/Luhn mod N algorithm

Information
has gloss	eng: The Luhn mod N algorithm is an extension to the Luhn algorithm (also known as mod 10 algorithm) that allows it to work with sequences of non-numeric characters. This can be useful when a check digit is required to validate an identification string composed of letters, a combination of letters and digits or even any arbitrary set of characters.
lexicalization	eng: Luhn mod N algorithm
instance of	(noun) a digit representing the sum of the digits in an instance of digital data; used to check whether errors have occurred in transmission or storage checksum