Integrated Circuit

Intelligence Community, a federation of United States agencies and organizations conducting intelligent activities

Internal combustion engine

Irreducible complexity

rare short version of the Roman numeral XCIX (99)

Informed consent, in clinical trials the form that has to be signed by the patient (subject) before entering the study

Identity card

Interstitial cystitis, a disease

Imperial College London, UK

Canary Islands' ISO 3166-1 code^[1]

In Casu, Latin for 'in this case'

International Coordinator, the top coordinator of the FidoNet

Iowa City, Iowa, USA

Intellectual capital

Indian Airlines' IATA airline designator

Ithaca College, USA

Intensive care medicine

Index of coincidence

International College, Beirut, Lebanon

InterCity certain long-distance passenger train services in Europe

IC brand school buses by Navistar International

axiom assuming the existence of an inaccessible cardinal

Ion Chromatography

Ice Crystals' METAR code

WWE Intercontinental Championship

Intentional Community

A Christogram

International Canoe in Canoe sailing

Internet slang for "I See"

Incident Commander

Interactive C, a programming language for robotic controllers

InterContinental hotel chain, or its parent company InterContinental Hotels Group

Industry Canada, division of the Canadian government

In Character, as opposed to OOC (out of character)

Index Catalogue

IC codes, police shorthand expressions

-ic suffix

Interchangeable core or interchangeable core lock cylinder

Illinois Central Railroad (AAR reporting marks IC)