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Unique identifier. A unique identifier ( UID) is an identifier that is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. [1] The concept was formalized early in the development of computer science and information systems. In general, it was associated with an atomic data type .
Universally unique identifier. A Universally Unique Identifier ( UUID) is a 128-bit label used for information in computer systems. The term Globally Unique Identifier ( GUID) is also used, mostly in Microsoft systems. [ 1][ 2] When generated according to the standard methods, UUIDs are, for practical purposes, unique.
A serial number is a unique identifier used to uniquely identify an item, and is usually assigned incrementally or sequentially. Despite being called serial "numbers", they do not need to be strictly numerical and may contain letters and other typographical symbols, or may consist entirely of a character string .
It had four unique digits, and 9.3% of eight-digit serial numbers have four or fewer digits. It contained two pairs together, which is true for only 10% of serial numbers on paper money.
A National Provider Identifier ( NPI) is a unique 10-digit identification number issued to health care providers in the United States by the Centers for Medicare and Medicaid Services (CMS). The NPI has replaced the Unique Physician Identification Number (UPIN) as the required identifier for Medicare services, and is used by other payers ...
A number is a mathematical object used to count, measure, and label. ... the square root of 2, that is, the unique positive real number whose square is 2.
In the United States, a Social Security number ( SSN) is a nine-digit number issued to U.S. citizens, permanent residents, and temporary (working) residents under section 205 (c) (2) of the Social Security Act, codified as 42 U.S.C. ยง 405 (c) (2). The number is issued to an individual by the Social Security Administration, an independent ...
Out of the 280 million Social Security numbers the firm studied across its network of databases, More than 20 million people have more than one number associated with their name. More than 40 ...