number assigned for identification which varies from its successor or predecessor by a fixed discrete integer value. Common usage has expanded the term to refer to any unique alphanumeric identifier for one of a large set of objects, however not every numerical identifier is a serial number; identifying numbers which are not serial numbers are sometimes called nominal numbers. In data processing and allied fields in computer science, the distinction between serial and nominal numbers is an important one.
Sequence numbers are almost always non-negative, and typically start at zero or one.
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