List of acronyms: I
This list contains acronyms, initialisms, and pseudo-blends that begin with the letter I. For the purposes of this list: acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words). (a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome (i) = initialism, e.g.: CD – (i) compact disc (p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women (s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz) Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P. (Main list of acronyms) I – (s) Iodine – One (in Roman numerals) == I0–9 == I2C or I-squared-C - (i) Inter-Integrated Circuit I2WD or I2WD – (i) U.S. Intelligence and Information Warfare Directorate (CERDEC) == IA == ia – (s) Interlingua language (ISO 639-1 code) IA – (s) Iowa (postal symbol) IAAF – (i) International Association of Athletics Federations ("International Amateur Athletics Federation" from 1912 to 2001; renamed "World Athletics" in 2019) IAAL – (i) I Am A Lawyer IAAS - (p) Infrastructure-as-a-Service IAB – (i) International Association for Biologicals IATA code of McConnell Air Force Base IACREOT – (i) International Association of Clerks, Recorders, Election Officials, and Treasurers IAD – (i) Ion Assisted Deposition IATA code for Washington Dulles International Airport IADS – (i) Integrated Air Defence System IAE - (i) International Aero Engines (aircraft engine joint venture) IAEA – (i) International Atomic Energy Agency IAF {i} Industrial Areas Foundation (i) Israeli Air Force IAFG – (i) Information Assurance Focus Group IAI – (i) International African Institute Israel Aircraft Industries IANA – (i) Internet Assigned Numbers Authority IANAL – (i) I Am Not A Lawyer IAPD International Associates of Paediatric(sic) Dentistry (i) Investment Adviser Public Disclosure iShares Asia Pacific Dividend IAQ – (i) Indoor air quality – Infrequently Asked Questions IAS – (i) Image Assessment System IASIP – (i) It's Always Sunny in Philadelphia IATA – (a/i) International Air Transport Association IATF – International Automotive Task Force IATSE – International Alliance of Theatrical Stage Employees IAU – (i) International Association of Universities – International Astronomical Union IAUC – (i) International Astronomical Union Circular IAW – (i) In Accordance With == IB == IB – (i) International Baccalaureate IBA – (i) Important Bird Area IBD – (i) Inflammatory Bowel Disease IBDM – (i) Information Based Decision Making IBDS – (i) Integrated Biological Detection System – International Business Development Specialist IBF - International Boxing Federation IBGe – (i) Isobutylgermane IBGE – (i) Instituto Brasileiro de Geografia e Estatística (Portuguese, "Brazilian Institute of Geography and Statistics") IBHOF - International Boxing Hall of Fame IBM – (i) International Business Machines ibo – (s) Igbo language (ISO 639-2 code) IBRD – (i) International Bank for Reconstruction and Development (part of the World Bank) IBS – (i) Irritable Bowel Syndrome == IC == IC (s) Ice Crystals (METAR Code) Iceland (FIPS 10-4 country code) (i) Integrated Circuit - [inner circle] ICANN – (a) Internet Corporation for Assigned Names and Numbers ICAO – (i) International Civil Aviation Organization ICBM – (i) Intercontinental Ballistic Missile ICBM – I see (phonetically "c") BatMan ICBN – (i) International Code of Botanical Nomenclature ICC (i) Integrated Command and Control International Criminal Court International Cricket Council Interstate Commerce Commission International Chamber of Commerce ICD (i) Implantable Cardioverter-Defibrillator Initial Capabilities Document International Classification of Diseases ICE (i/a) (U.S.) Immigration and Customs Enforcement In case of emergency Internal Combustion Engine (Vehicles) 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.