With reference to a given (possibly implicit) set of objects, a unique identifier (UID) is any identifier which is guaranteed to be unique among all identifiers used for those objects and for a specific purpose. The concept was formalized early in the development of Computer science and Information systems, in general it was associated with atomic data type.
There are some main types of unique identifiers, each corresponding to a different generation strategy:
- serial numbers, assigned incrementally or sequentially, by a central authority or accepted reference.
- random numbers, selected from a number space much larger than the maximum (or expected) number of objects to be identified. Although not really unique, some identifiers of this type may be appropriate for identifying objects in many practical applications and are, with informal use of language, still referred to as "unique"
- names or codes allocated by choice which are forced to be unique by keeping a central registry such as the EPC Information Services.
- names or codes allocated using a regime involving multiple (concurrent) issuers of unique identifiers that are each assigned mutually exclusive partitions of a global address space such that the unique identifiers assigned by each issuer in each exclusive address space partition are guaranteed to be globally unique. Examples include (1) the media access control address MAC address uniquely assigned to each individual hardware network interface device produced by the manufacturer of the devices, (2) consumer product bar codes assigned to products using identifiers assigned by manufacturers that participate in GS1 identification standards, and (3) the unique and persistent Legal Entity Identifier assigned to a legal entity by one of the LEI registrars in the Global Legal Entity Identifier System (GLEIS) managed by the Global LEI Foundation (GLEIF).
The above methods can be combined, hierarchically or singly, to create other generation schemes which guarantee uniqueness. In many cases, a single object may have more than one unique identifier, each of which identifies it for a different purpose.
- National identification number
- ORCID (Open Researcher and Contributor ID)
- Digital object identifiers (DOI)
- International Standard Book Number (ISBN)
- Electronic Identifier Serial Publication (EISP)
- Electronic Product Code (EPC)
- International eBook Identifier Number (IEIN)
- Stock keeping unit (SKU)
- Part number
- Universally unique identifier (UUID)
- Numbering scheme
- Track and trace
- Payment card number
- Object identifier (OID)
- Legal Entity Identifier (LEI)
National identification numberEdit
National identification number is used by the governments of many countries as a means of tracking their citizens, permanent residents, and temporary residents for the purposes of work, taxation, government benefits, health care, and other governance-related functions.
- Cryptographic hashes
- Organizationally unique identifier (OUI)
- Universally unique identifier (UUID)
- Identity correlation
- World Wide Port Name
- MAC address
Economics, tax and regulationEdit
Internet architecture and standardsEdit
- Request for Comments (RFC)
- Internet Standard (STD)
- Best Current Practice (BCP)
- For Your Information (FYI)
- Internet Draft (I-D)
- Internet Experiment Note (IEN)
- RARE Technical Reports (RTR)
- McMurry, Julie A.; Juty, Nick; Blomberg, Niklas; Burdett, Tony; Conlin, Tom; Conte, Nathalie; Courtot, Mélanie; Deck, John; Dumontier, Michel; Fellows, Donal K.; Gonzalez-Beltran, Alejandra; Gormanns, Philipp; Grethe, Jeffrey; Hastings, Janna; Hériché, Jean-Karim; Hermjakob, Henning; Ison, Jon C.; Jimenez, Rafael C.; Jupp, Simon; Kunze, John; Laibe, Camille; Le Novère, Nicolas; Malone, James; Martin, Maria Jesus; McEntyre, Johanna R.; Morris, Chris; Muilu, Juha; Müller, Wolfgang; Rocca-Serra, Philippe; Sansone, Susanna-Assunta; Sariyar, Murat; Snoep, Jacky L.; Soiland-Reyes, Stian; Stanford, Natalie J.; Swainston, Neil; Washington, Nicole; Williams, Alan R.; Wimalaratne, Sarala M.; Winfree, Lilly M.; Wolstencroft, Katherine; Goble, Carole; Mungall, Christopher J.; Haendel, Melissa A.; Parkinson, Helen (2017). "Identifiers for the 21st century: How to design, provision, and reuse persistent identifiers to maximize utility and impact of life science data". PLOS Biology. 15 (6): e2001414. doi:10.1371/journal.pbio.2001414. ISSN 1545-7885. PMC 5490878. PMID 28662064.
- Kline, Kevin E. (2009). SQL in a nutshell. Kline, Daniel; Hunt, Brand (3rd ed.). Beijing: O'Reilly. ISBN 978-0-596-51884-4. OCLC 244652620.
- Haak, Laurel L.; Fenner, Martin; Paglione, Laura; Pentz, Ed; Ratner, Howard (2012). "ORCID: a system to uniquely identify researchers". Learned Publishing. 25 (4): 259–264. doi:10.1087/20120404. ISSN 0953-1513.