Editing ID (section)

==Science, technology, and mathematics==
===Biology and medicine===
* [[Ide (fish)]], also spelled Id
* [[Infectious disease]]
* [[Infectious dose]]
* [[Insomnia disorders|Insomnia disorder]]
* [[Intellectual disability]], a generalized neurodevelopmental disorder

===Computing===
* [[Id (programming language)]], a parallel functional programming language
* [[iD (software)]], an editor for OpenStreetMap geodata
* [[id (Unix)]], a command to retrieve group and user identification
* [[.id]], the Internet Top Level Domain code for Indonesia
* id, the generic object datatype in the [[Objective-C]] programming language
* [[Instruction decoder]], a decoder in CPUs
* [[Internet Draft]], a working document of the IETF

===Design and engineering===
* [[Industrial design]], a process of designing products for mass production
* [[Information design]], the practice of presenting information in a way that fosters understanding
* [[Inside diameter]], also 'inner diameter' or 'I.D.'; a dimension commonly used to specify the size of tubing or pipe
* [[Interaction design]], the practice of designing interactive digital products, environments, systems, and services
* [[Interior design]], the art and science of enhancing the interior of a building
* [[Instructional design]], the study of creating better instructional experiences

===Mathematics===
* [[Identity function]], a function that always returns the same value that was used as its argument
* [[Influence diagram]], a graphical and mathematical representation of a decision situation
* [[Icosidodecahedron]], a uniform polyhedron

===Psychology===
* Id, one of the [[Id, ego and super-ego#Id|Id, ego and super-ego]] psychic apparatus defined in Sigmund Freud's structural model of the psyche