(Main list of acronyms)

__NOTOC__

  • I – (s) Iodine – One (in Roman numerals)

I0–9

  • I<sup>2</sup>C or I-squared-C - (i) Inter-Integrated Circuit
  • I2WD or I<sup>2</sup>WD – (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&nbsp;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 I<sup>2</sup>C - (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: