ID explained

ID, I.D. or id may refer to:

In abbreviations:

• Identification
  • Identity card, a card used to establish positive identification of an individual
• the id in the Id, ego, and super-ego psychological construct
• Intelligent design, a modern form of the teleological argument (an argument for the existence of a god) which argues that life was designed
• Industrial design
• an abbreviation for the Latin idem.

In codes:

• Indonesia, ISO 3166-1 alpha-2 country code ID (Internet TLD: .id)
  • Indonesian language, ISO 639 alpha-2 code id
• the United States postal abbreviation for Idaho
• Interlink Airlines, IATA airline code

In computer science:

• in the Objective-C programming language id is the designation of the generic object datatype
• id Software, the computer game software developer
• iD (video game), is a 1980s video game by Mel Croucher
• Internet Draft, a working document of the IETF
• ProductID and VendorID in device drivers

In geography:

• İd, town in Turkey

In popular culture:

• i-D, a British fashion magazine
• I.D. (magazine), and American magazine focusing on Architecture, Graphic and Industrial Design
• I.D. (film), the 1995 British film, directed by Philip Davis
• iD Two, RTÉ television programme
• ID (manga), a Korean manhua of the European fantasy genre
• Investigation Discovery, an American cable channel which is abbreviated as ID.

In mathematics:

• Influence diagram, a graphical and mathematical representation of a decision situation
• Inside diameter, a dimension commonly used to specify the size of tubing or pipe
• An identity function, a function that always returns the same value that was used as its argument.

Other uses:

• The Citroën ID, a variant of the Citroën DS
• In India, the Muslim religious festival of Id-ul-Fitr