List of acronyms and initialisms: I
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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 a series of constituent letters, e.g., SARS = severe acute respiratory syndrome
- initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc
- pseudo-blend = an abbreviation whose extra or omitted letters means that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
- (a) = acronym in the example: SARS - (a) Severe acute respiratory syndrome
- (i) = initialism in the example: CD - (i) Compact disc
- (p) = pseudo-blend in the example: UNIFEM - (p) United Nations Development Fund for Women
- (s) = symbol (none of the above, representing and pronounced as something else; for example: MHz - Megahertz)
[edit] Add new entries here or in the sub-pages
Please add your own entries, in this page or in the appropriate sub-page. Use a quasi-dictionary order, with lowercase treated the same as uppercase and ignoring non-alphanumeric characters (hyphens and such). This means that only alphanumeric characters have any significance in determining order, and that lowercase letters occupy the same ordering position as uppercase (in tie-breaker cases, list lower case first). For example: Ka appears before KA. (This differs from a strict ASCII ordering.)
(Main list of acronyms and initialisms)
| Contents: | Top - I0–9 IA IB IC ID IE IF IG IH II IJ IK IL IM IN IO IP IQ IR IS IT IU IV IW IX IY IZ |
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[edit] I0-9
- I2WD or I²WD - (i) U.S. Intelligence and Information Warfare Directorate (CERDEC)
[edit] 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 1912-2001)
- IAAL - (i) I Am A Lawyer
- IAB - (i) International Association for Biologicals
- IACREOT - (i) International Association of Clerks, Recorders, Election Officials, and Treasurers
- IAD - (i) Ion Assisted Deposition
- IADS - (i) Integrated Air Defence System
- IAEA - (i) International Atomic Energy Agency
- IAF - {i} Industrial Areas Foundation
- 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
- IANASB - (i) I Am Not A Shark Bioligst / Stock Broker / Sentient Being
- 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
- IAU - (i) International Association of Universities - International Astronomical Union
- IAUC - (i) International Astronomical Union Circular
- IAW - (i) In Accordance With
[edit] 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
- 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
[edit] 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
- 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
- ICES - (a/i) International Council for the Exploration of the Seas
- 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
[edit] 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
- IDA - (i) U.S. Institute for Defense Analyses - International Development Association (part of the World Bank
- IDC - (i) International Data Corporation
- IDE - (i) Integrated Development Environment - Integrated Drive Electronics
- IDEA - (a) Individuals with Disabilities Education Improvement Act
- IDF - (i) Israel Defence Forces - Intel Development Forum - International Dairy Federation
- IDK - (i) I don't know
- 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
[edit] 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) Initial Entry Training
- IETF - (i) Internet Engineering Task Force
- IEW - (i) Intelligence and Electronic Warfare
[edit] IF
- IFAH - (i) International Federation for Animal Health
- IFAP - (i) International Federation of Agricultural Producers
- 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
[edit] IG
- ig - (s) Igbo language (ISO 639-1 code)
- IG - (i) Inspector General
- IGNOU - (a) Indira Gandhi National Open University
- IGS - (i) International Ground Station
- IGY - (i) International Geophysical Year
[edit] 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
- IHR - (i) Institute for Historical Review
[edit] II
- ii - (s) Sichuan Yi language (ISO 639-1 code)
- II - (s) Two (in Roman numerals)
- 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)
- IIRC - (i) If I Recall/Remember Correctly
- IISS - (i) International Institute for Strategic Studies
- IIT - (i) Illinois Institute of Technology - Indian Institutes of Technology - Indiana Institute of Technology
- I/ITSEC - (a) Interservice/Industry Training, Simulation and Education Conference ("eye-it-sec" or "it-sec")
[edit] IJ
- IJN - (i) Imperial Japanese Navy (World War II)
- IJWP - (i) Interim Joint Warfare Publication
[edit] 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)
[edit] IL
- IL - (s) Illinois (postal symbol) - Israel (ISO 3166 digram)
- ILC - (i) International Law Commission - International Linear Collider
- ILDS - (i) Improved Landmine Detection System
- ile - (s) Interlingue language (ISO 639-2 code)
- ILO - (i) International Labour Organization
- ILRI - (i) International Livestock Research Institute
- ILS - (s) Israeli shekel (ISO 4217 currency code)
- ILY - (s) IATA code for Islay Airport (Scotland), (i) I Love You [pronounced ILL-LEE]
[edit] IM
- IM - (s) Isle of Man (FIPS 10-4 territory code) - (i) Instant Message (internet speech)
- IMA - (i) Intermediate Maintenance Activity
- IMBD - (i) International Migratory Bird Day
- IMDB - Internet Movie Database
- IMF - (i) International Monetary Fund
- IMHO - (i) In My Humble Opinion (or In My Honest Opinion)
- IML - (i) International Mister Leather
- IMLAST - (i) International Movement for Leisure Activities in Science and Technology - see MILSET
- IMNSHO - (i) In My Not So Humble Opinion
- IMO - (i) In My Opinion - International Maritime Organization
- 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 - 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 - International Mind Sports Association - International Motor Sports Association
- IMT - (i) Integrated Management Tool
- IMU - (i) International Mathematical Union
[edit] IN
- In - (s) Indium
- IN - (s) gamelux (FIPS 10-4 country code; ISO 3166 digram) - Indiana (postal symbol) - Infantry
- ina - (s) Interlingua language (ISO 639-2 code)
- INA - (p) Immigration and Nationality Act
- INAS - (a) International Near-Earth Asteroid Survey
- INC - (i) Iglesia ni Cristo (Filipino, "Church of Christ") - Indian National Congress - International Network of Crackers - Iraqi National Congress
- INCITS - (p) InterNational Committee for Information Technology Standards
- ind - (s) Indonesian language (ISO 639-2 code)
- IND - (s) India (ISO 3166 trigram)
- INDIGO - (p) (U.S.) INtelligence DIvision Gaming Operation
- INFORMS - (a) (U.S.) Institute for Operations Research and the Management Sciences
- INFOSEC - (p) Information Security
- INLA - (i) Irish National Liberation Army
- INMARSAT - (p) International Maritime Satellite organization
- INR - (s) Indian rupee (ISO 4217 currency code)
- INRI - (a/i) Iesus Nazarenus Rex Iudæorum (Latin, "Jesus of Nazareth, King of the Jews")
- INRIA - (p) Institut national de recherche en informatique et en automatique
- INS - (i) Immigration and Naturalization Service
- InSAR - (p) Interferometric synthetic aperture radar
- INST - (p) Information Standards and Technology
- in trans. - (p) in transitu (Latin, "in transit")
- INTSUM - (p) Intelligence Summary
- INTERFET - (p) International Force for East Timor
[edit] IO
- io - (s) Ido language (ISO 639-1 code)
- IO - (s) British Indian Ocean Territory (ISO 3166 digram; FIPS 10-4 territory code)
- IOC - (i) Initial Operational Capability - Intergovernmental Oceanic Commission - International Olympic Committee - International Ornithological Congress
- IOM - (i) Iowa, Ohio, Michigan (soybean origin) - Institute of Medicine - International Organisation for Migration - Isle of Man
- IONA - (i) Islands of the North Atlantic (alternate name for Great Britain, Ireland, the Isle of Man, and related islands)
- IOT - (s) British Indian Ocean Territory (ISO 3166 trigram)
- IOT&E - (i) Integrated Operational Test and Evaluation
- IOU - (p) "I Owe You" (Promissory note)
[edit] IP
- IP - (s) Clipperton Island (FIPS 10-4 territory code) - (i) Initial Point - Intellectual Property - Internet Protocol
- IPA - (i) India Pale Ale - International Phonetic Alphabet - Isopropyl alcohol
- IPB - (i) Intelligence Preparation of the Battlefield
- IPCC - (i) Intergovernmental Panel on Climate Change - Independent Police Complaints Commission
- ipk - (s) Inupiaq language (ISO 639-2 code)
- IPL - (i) Inferior Parietal Lobule
- IPN - (i) Instytut Pamieci Narodowej (Polish, "Institute for National Memory")
- IPO - (i) Initial Public Offering
- IPR - (i) In Progress Review - Intellectual Property Rights - Intelligence Production Requirement
- IPT - (i) Integrated Product/Project Team
- IPTS - (i) Institute for Prospective Technological Studies
- IPTV - (p) Internet Protocol TeleVision
- IPW - (i) Interrogation of Prisoners of War
[edit] IQ
- iq - (i) idem quod (Latin, "the same as")
- IQ - (i) Intelligence Quotient - (s) Iraq (ISO 3166 digram)
- IQD - (s) Iraqi dinar (ISO 4217 currency code)
[edit] IR
- Ir - (s) Iridium
- IR - (i) Infrared - Intelligence requirement (military) - (s) Iran (FIPS 10-4 country code; ISO 3166 digram) - Iran Air (IATA alpha code) see entry for more
- IRA - (i) Individual Retirement Account - Irish Republican Army (see also List of organisations known as the Irish Republican Army for groups claiming descent from this organisation)
- IRAS - (p) Infrared Astronomical Satellite
- IRB - (i) International Rugby Board
- IRBM - (i) Intermediate Range Ballistic Missile
- IRC - (i) International Red Cross - International Reply Coupon - Internet Relay Chat
- IREA - (i) Intermountain Rural Electric Association
- IRL – (s) Ireland (ISO 3166 trigram) - Industrial Research Limited - Indy Racing League
- IRM - (i) Illinois Railway Museum - Inzhenernaya Razvedyvatelnaya Mashina (Russian Инженерная Разведывательная Машина, "Engineer Reconnaissance Vehicle") †
- IRN - (s) Iran (ISO 3166 trigram)
- IRO - (i) International Refugee Organisation
- IRQ - (s) Iraq (ISO 3166 trigram)
- IRR - (s) Iranian rial (ISO 4217 currency code)
- IRS - (i) U.S. Internal Revenue Service
- IRSN - (i) Institut de radioprotection et de sûreté nucléaire (French, "Institute for Radiation Protection and Nuclear Safety")
- IRST - (i) Infra-red Search and Track
[edit] IS
- is - (s) Icelandic language (ISO 639-1 code)
- IS - (s) Iceland (ISO 3166 digram) - Israel (FIPS 10-4 country code)
- ISA - (i) Individual Savings Account - Industry Standard Architecture - Instruction Set Architecture - International Seabed Authority
- ISAAA - (i) International Service for the Acquisition of Agri-biotech Applications
- ISAF - (a) International Sailing Federation - International Security Assistance Force
- ISAR - (a) Inverse SAR (Synthetic Aperture Radar)
- ISB - (i) Intermediate Staging Base
- ISBN - (i) International Standard Book Number (ISO 2108)
- ISCCP - (i) International Satellite Cloud Climatology Project
- ISCII - (a) Indian Standard Code for Information Interchange
- ISDN - Integrated Services Digital Network
- ISEF - (a) Intel International Science and Engineering Fair
- ISEN - (i) Internet Search Environment Number
- ISF - (i) Internal Security Force
- ISIS - (i/a) Institute for Science and International Security
- ISK - (s) Icelandic krona (ISO 4217 currency code)
- isl - (s) Icelandic language (ISO 639-2 code)
- ISL - (s) Iceland (ISO 3166 trigram)
- ISLN - (i) International Standard Lawyer Number
- ISM - (i) Industrial, scientific or medical - (p) Interstellar medium
- ISMB - (i) International Society of Matrix Biologists
- ISMC - (i) Intelligent Sounding Meaningless Conversation
- ISO - (i) In Search Of - (s) International Organization for Standardization (from the Greek ίσος, isos, meaning "equal")
- ISOGP - (i) Indian Society of Orthodontics for General Practitioners[1]
- ISP - (i) International Standardized Profile - Internet Service Provider - Information Systems Professional
- ISPE - (a/i) International Society for Pharmacoepidemiology
- ISR - (i) Intelligence, Surveillance and Reconnaissance - (s) Israel (ISO 3166 trigram)
- ISRO - (i) Indian Space Research Organisation
- ISS - (i) International Shorebird Survey (North America) - International Space Station
- ISSCR - (i) International Society for Stem Cell Research
- ISSN - (i) International standard serial number (ISO 3297)
- IST - (i) Information System Technology - UCF Institute for Simulation and Training
- ISTAR - (i) Intelligence, Surveillance, Target Acquisition, and Reconnaissance
- ISTC - (i) UK. Institute of Scientific and Technical Communications
- ISTS - (i) Intel Science Talent Search
- ISU - (i) Integrated Sight Unit - International Skating Union
[edit] IT
- it - (s) Italian language (ISO 639-1 code)
- IT - (i) InferoTemporal (neurophysiology) - Information Technology - (s) Italy (FIPS 10-4 country code; ISO 3166 digram)
- ita - (s) Italian language (ISO 639-2 code)
- ITA - (s) Italy (ISO 3166 trigram)
- ITAG - (i) Inertial Terrain-Aided Guidance
- ITALY - (a) I'll Truly Always Love You
- ITAS - (i) Improved Target Acquisition Sight
- ITC - (i) InferoTemporal Cortex (neurophysiology)
- ITEC - (a) Information Technology Exposition & Conference
- ITEMS - (a) Interactive Tactical Environment Management System
- ITER - (a) International Thermonuclear Experimental Reactor
- ITF - (a) International Tennis Federation
- ITK - (a) In The Know
- ITN - (i) Independent Television News (British)
- ITS - (i) Incompatible Time-sharing System - Individual Training Standards
- ITT - (i) International Telephone and Telegraph (U.S.)
- ITTO - (i) International Tropical Timber Organization
- ITU - (i) Intent-to-Use - International Telecommunication Union (International Telegraph Union 1865-1932)
[edit] IU
- iu - (s) (s) Inuktitut language (ISO 639-1 code)
- IUCN - (i) International Union for the Conservation of Nature and Natural Resources (World Conservation Union)
- IUPAC - (a) International Union of Pure and Applied Chemistry (pronounced "eye-yoo-pac")
- IUSS - (i) Integrated Undersea Surveillance System - Integrated Unit Simulation System - International Union of Soil Sciences
[edit] IV
- IV - (s) Côte d'Ivoire (FIPS 10-4 country code; from Ivory Coast) - Four (in Roman numerals) - (i) IntraVenous (as in intravenous drip or intravenous therapy)
- IVD - (i) Internet Video Device, intra vas device
- Iveco - (p) Industrial Vehicles Corporation
- IVF - (i) In Vitro Fertilisation
- IVI - (i) Interchangeable Virtual Instrument
- IVIS - (i/a) Inter-Vehicle Information System
- IVL - (i) Inter-Visibility Line
- IVM - (i) In Vitro [Oocyte] Maturation
- IVO - (i) In Vicinity Of
[edit] IW
- IW - (i) Information Warfare
- IWARS - (p) Infantry Warrior Simulation
- IWC - (i) International Whaling Commission
- IWW - (i) Industrial Workers of the World
[edit] IX
[edit] IY
- IY - (s) Iraq-Saudi Arabia Neutral Zone (FIPS 10-4 territory code; obsolete 1993)
[edit] IZ
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