A
serial number is a unique
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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