Numerical digit | Cyclic redundancy check | Forum check | Check Point | Check My Brain | Digit Fund | Check Yes Juliet | check | traveler's check | Tartan Check | Reality Check | reality check | Pelvic digit | Occurs check | numerical digit | Digit ratio | Cross-check | Check valve | Check Please | check (fabric) | Check card | cashier's check |
Check digits and parity bits are special cases of checksums, appropriate for small blocks of data (such as Social Security numbers, bank account numbers, computer words, single bytes, etc.
The Damm algorithm does not suffer from exceeding the number of 10 possible values, resulting in the need for using a non-digit character (as the X in the 10-digit ISBN check digit scheme).
Verhoeff algorithm, a check digit algorithm invented by Jacobus Verhoeff