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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.
Organizationally unique identifier. An organizationally unique identifier ( OUI) is a 24-bit number that uniquely identifies a vendor, manufacturer, or other organization. OUIs are purchased from the Institute of Electrical and Electronics Engineers (IEEE) Registration Authority by the assignee (IEEE term for the vendor, manufacturer, or other ...
An identifier is a name that identifies (that is, labels the identity of) either a unique object or a unique class of objects, where the "object" or class may be an idea, physical countable object (or class thereof), or physical noncountable substance (or class thereof). The abbreviation ID (or Id) often refers to identity, identification (the ...
The Unique Device Identification (UDI) System is intended to assign a unique identifier to medical devices within the United States, Europe, China, South Korea, Saudi Arabia and Taiwan. [1] It was signed into law in the US on September 27, 2007, as part of the Food and Drug Administration Amendments Act (Section 226) of 2007 .
A Uniform Resource Identifier ( URI) is a unique sequence of characters that identifies an abstract or physical resource, [1] such as resources on a webpage, mail address, phone number, [2] books, real-world objects such as people and places, concepts. [3] URIs are used to identify anything described using the Resource Description Framework ...
Website. www .doi .org. A digital object identifier ( DOI) is a persistent identifier or handle used to uniquely identify various objects, standardized by the International Organization for Standardization (ISO). [1] DOIs are an implementation of the Handle System; [2] [3] they also fit within the URI system ( Uniform Resource Identifier ).
A non-primary key that can be used to identify only one row in a table. Alternate keys may be used like a primary key in a single-table select. Foreign. A key that has migrated to another entity. At the most basic definition, "a key is a unique identifier", [1] so unique key is a pleonasm.