SELF-CHECKING DIGIT is where an extra digit is added to a number. The extra digit is computed from the other digits in the number. The computer program can then check input by recomputing and comparing the check digit. This is a useful control over the input of account numbers.
FREQUENCY, in advertising, is the number of times you hope to reach your target audience through your advertising campaign.
PRO-FORMA is to provide in advance to a prescribed form or to describe item, e.g. pro forma financial statement or pro forma invoice.
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