(Main list of acronyms)
__NOTOC__ 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. 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 (i) International Championship Wrestling (defunct US professional wrestling promotion) ICYMI – (i) In Case You Missed It ICZN (i) International Code of Zoological Nomenclature International Commission on Zoological Nomenclature
ID id – (s) Indonesian language (ISO 639-1 code) ID (s) Idaho (postal symbol) (p) Identity (s) Indonesia (FIPS 10-4 country code; ISO 3166 digram) (i) Infantry Division Intelligent Design ID10T Error – (i) Idiot User Error (IT help desk inside joke) IDA (i) U.S. Institute for Defense Analyses International Development Association (part of the World Bank IDC – (i) International Data Corporation "I Don't Care" IDDI – (i) I don't do initialisms (see irony) IDE (i) Integrated Development Environment Integrated Drive Electronics IDeA – (a) Improvement and Development Agency, the former name of Local Government Improvement and Development in the United Kingdom IDEA (a) Individuals with Disabilities Education Act (U.S.) International Data Encryption Algorithm International Design Excellence Awards IDF (i) Israel Defense Forces Intel Development Forum International Dairy Federation IDGAF – (i) I don't give a f**k IDK – (i) I don't know IDKIBTI – I don't know, I'm black, that's it IDL – (i) Interface Definition Language IDN – (s) Indonesia (ISO 3166 trigram) ido – (s) Ido language (ISO 639-2 code) IDR – (s) Indonesian rupiah (ISO 4217 currency code) IDTS – (i) I don't think so
IE i.e. – (i) id est (Latin, roughly "that is") ie – (s) Interlingue language (ISO 639-1 code) IE – (i) Indo-European languages – Internet Explorer – (s) Ireland (ISO 3166 digram) – Iced Earth IEA – (i) International Energy Agency IEC – (i) International Electrotechnical Commission IED – (i) Improvised Explosive Device IEEE – (p) Institute of Electrical and Electronics Engineers ("I triple-E") IELTS – (a) International English Language Testing System IER – (i) Information Exchange Requirement IET – (i) Institution of Engineering and Technology IET – (ii) Initial Entry Training IETF – (i) Internet Engineering Task Force IEW – (i) Intelligence and Electronic Warfare
IF IFAB – (i) International Football Association Board IFAH – (i) International Federation for Animal Health IFAP – (i) International Federation of Agricultural Producers, (i) International Fashion Academy Pakistan IFC – (i) International Finance Corporation (part of the World Bank) – (a) Independent Film Channel IFF – (i) Identification, Friend or Foe – Individually Fresh Frozen – International Flavors and Fragrances IFFN – (i) Identification, Friend, Foe, or Neutral IFO – (i) Identified Flying Object (see also UFO) IFOR – (p) UN Implementation Force – (i) Institute for Operations Research – International Fellowship of Reconciliation IFOV – (i) Instantaneous Field of View IFPI – (i) International Federation of Phonographic Industries IFR – (i) Instrument Flight Rules IFRB – (i) International Frequency Registration Board IFV – (i) Infantry Fighting Vehicle
IG ig – (s) Igbo language (ISO 639-1 code) IG – (i) Inspector General Instagram IGFA – International Game Fish Association IGM - IATA code for Kingman Airport IGNOU – (a) Indira Gandhi National Open University IGS – (i) International Ground Station IGY – (i) Israeli Gay Youth – International Geophysical Year
IH IHÉS – (i) Institut des Hautes Études Scientifiques (French, Institute of Advanced Scientific Studies) IHH – (i) Idiopathic Hypogonadotropic Hypogonadism IHO – (i/a) International Hydrographic Organization IHOP – (i/a) International House of Pancakes, the original name of this American restaurant chain ("EYE-hop") IHR – (i) Institute for Historical Review IHSI – Institutum Historicum Societatis Iesu (Jesuit Historical Institute)
II ii – (s) Sichuan Yi language (ISO 639-1 code) II – (s) Two (in Roman numerals) IIC or I2C - (i) Inter-Integrated Circuit IICA – (i) Inter-American Institute for Cooperation on Agriculture IIE – (i) Innovative Interstellar Explorer iii – (s) Sichuan Yi language (ISO 639-2 code) III – (s) Three (in Roman numerals) IIMSS – If I May Say So IIRC – If I Remember Correctly, If I Recall Correctly IISS – (i) International Institute for Strategic Studies IIT – (i) Illinois Institute of Technology – Indian Institutes of Technology – Indiana Institute of Technology IITM – (i) Image Institute of Technology & Management – Indian Institute of Technology Madras – Indian Institute of Tropical Meteorology I/ITSEC – (a) Interservice/Industry Training, Simulation and Education Conference ("eye-it-sec" or "it-sec")
IJ IJN – (i) Imperial Japanese Navy (World War II) IJWP – (i) Interim Joint Warfare Publication
IK ik – (s) Inupiaq language (ISO 639-1 code) IKEA – (a) Ingvar Kamprad (the company's founder), Elmtaryd (the farm where he was born and raised), Agunnaryd (a village and parish near the farm) iku – (s) (s) Inuktitut language (ISO 639-2 code)
IM IM (s) Isle of Man (FIPS 10-4 territory code) (i) Instant Message (Internet speech) IMA (i) Intermediate Maintenance Activity Institute of Mathematics and Applications – (i) International Migratory Bird Day IMDb – Internet Movie Database IME - (i) In My Experience IMF (i) id music file/id's music format (audio file format) Impossible Missions Force, the protagonist organization in the Mission: Impossible media franchise International Monetary Fund (the most common use for the initialism) IMHO – (i) In My Humble/Honest Opinion, cf. IMO IMIST AMBO – used to facilitate an informed clinical handover between paramedics, emergency department staff or other healthcare similar to SBAR: Identification, Method of Injury, Index of concern, Signs, Treatment, Allergies, Medication, Background, and Other IML – (i) International Mister Leather IMLAST – (i) International Movement for Leisure Activities in Science and Technology – see MILSET IMNM - (i) - Immune-mediated necrotizing myopathy a rare, but serious ADR of statins IMNSHO – (i) In My Not So Humble Opinion IMO (in my opinion) – (i) In My Opinion, also "imo", cf. IMHO IMPAC – (a) International Merchant Purchase Authorization Card IMPACT – (a) International Medical Products Anti-Counterfeiting Taskforce IMPATT – (p) IMPact Avalanche Transit Time diode IMPT – (i) Institute of Maxillofacial Prosthetists and Technologists IMR – (i) Inzhenernaya Mashina Razgrazhdeniya (Russian Инженерные Машины Разграждения, "Engineer Vehicle Obstacle-Clearing") † IMRI (i) Industrial Membrane Research Institute Information Management Research Institute Institut pour le management de la recherche et de l'innovation (French, "Institute for the Management of Research and Innovation") International Market Research Information Intraoperative Magnetic Resonance Imaging IMRO Internal Macedonian Revolutionary Organization Irish Music Rights Organisation IMRL – (i) Individual Material Readiness List IMS (i) Information Management System International Meat Secretariat Ion Mobility Spectrometer IMSA (i) Illinois Mathematics and Science Academy