SAFETY STOCK (SS) or security stock ensures that the item is available up to the pre-defined required service level, even when the re-ordered material arrives later then expected, or the fluctuations in demand during the lead-time cause the demand to be larger then expected. See also STOCK RESERVE.
PROFESSIONAL SUBSCRIBER means all other persons who do not meet the definition of Non-Professional Subscriber. See NON-PROFESSIONAL SUBSCRIBER.
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.
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