Definitions for "Check digit"
A digit within a symbol whose value is based mathematically on other characters included in the symbol. It is used for the purpose of performing a mathematical check to ensure the accuracy of the read.
A character, usually but not always a number, included within a symbol whose value is based mathematically on other characters included in the symbol. It is used to ensure the accuracy of the read. See Mod numbering
The final digit of a routing/transit number, which may be used to test the validity of a specific routing/transit number.
a calculated value that represents a set of data
Keywords:  item, security, interesting
an interesting security item