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check digit

   Also found in: Wikipedia, Hutchinson 0.01 sec.

A numeric digit used to ensure that account numbers are entered accurately into the computer. Using a formula, a digit is calculated from each new account number, which is then made part of that number, either at the end, the beginning or somewhere in the middle of the number.

When an account number with the check digit is entered, the data entry program recalculates the check digit and compares it to the check digit entered. If the digits are not equal, the account number is considered invalid.
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We had surprisingly few problems with typing errors, as indicated by the internal Check Digit Verification of CAS Registry Numbers (17).
Data Quality in Predictive Toxicology: Identification of Chemical ... by Gottmann, Eva / Environmental Health Perspectives
However, most modern implementations of barcodes require complicated check digit calculations for error correction that cannot be performed by the fonts themselves.
IDAUTOMATION.COM, INC. RELEASES MS OFFICE MACROS AND VISUAL BASIC ... by EDP Weekly's IT Monitor
Of the three drives, two hold actual data, while a third contains check digits.
Averting disaster with redundant hardware by Brown, Steven D. / The Tax Adviser
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