English to Dutch Other IT (Information Technology) berekening van controlesommen

Context:
Select the calculation scheme for the checksum.
If you use a scheme that uses weighted letters you must enter the weighting in the table

De klant geeft daarbij de volgende toelichting:
Weighted letters in a checksum have numerical values assigned to them so that you can calculate an overall checksum from a combination of letters and numbers. The weighting is the numerical value.

Maar hoe noem je weighted letters nou in het NL?