IC
- IC – (s) Ice Crystals (METAR Code) – Iceland (FIPS 10-4 country code) – (i) Integrated Circuit -
- ICANN – (a) Internet Corporation for Assigned Names and Numbers
- ICAO – (i) International Civil Aviation Organization
- ICBM – (i) Intercontinental Ballistic Missile
- ICBM - I see(phoenetically "c") BatMan
- ICBN – (i) International Code of Botanical Nomenclature
- ICC – (i) Integrated Command and Control – International Criminal Court – International Cricket Council – Interstate Commerce Commission
- ICD – (i) Implantable Cardioverter-Defibrillator – Initial Capabilities Document – International Classification of Diseases
- ICE – (i/a) In case of emergency
- ICES – (a/i) International Council for the Exploration of the Sea
- ICF – (i) Intelligent Community Forum
- ICHTHYS – (a) Iesous Christos, Theou Yios, Soter (Greek, "Jesus Christ, Son of God, Savior")
- ICM – (i) Improved Conventional Munition – Integrated Collection Management – International Congress of Mathematicians – Iraq Campaign Medal
- ICMP – (i) Internet Control Message Protocol
- ICNAF – (i) International Commission for the Northwest Atlantic Fisheries (became NAFO in 1978)
- ICNI – (i) Integrated Communication, Navigation, and Identification
- ICO – (i) Intermediate Circular Orbit
- ICP – (i) Inductively coupled plasma – Insane Clown Posse
- ICPE – (a/i) International Conference on Pharmacoepidemiology, the annual conference of the International Society for Pharmacoepidemiology
- ICRAF – (i) International Centre for Research in Agroforestry (a.k.a. World Agroforestry Centre since 2002)
- ICRISAT – (i/a) International Crops Research Institute for the Semi-Arid Tropics
- ICRL – (i) Individual Component Repair List
- ICRS – (i) International Celestial Reference System
- ICS – (i) In-Country Support – Intelligence and Communications Systems – Interim Contractor Support
- ICSI – (p) Intracytoplasmic Sperm Injection
- ICT – (i) Information and communication technologies
- ICTH – (i) Island Closest to Heaven/Hell Final Fantasy VIII
- ICV – (i) Infantry Carrier Vehicle
- ICW – (i) In Co-ordination With – Indonesia Corruption Watch – Infectious and Chemotherapeutic Waste – Insulating Concrete Wall – Integral Crystalline Waterproofing – (p) Interactive Courseware
- ICZN – (i) International Code of Zoological Nomenclature – International Commission on Zoological Nomenclature
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