(Main list of acronyms) __NOTOC__ * I – (s) Iodine – One (in Roman numerals)

I0–9

* I2WD or I²WD – (i) U.S. Intelligence and Information Warfare Directorate ( CERDEC)

IA

* ia – (s)

Interlingua Interlingua (; ISO 639 language codes ia, ina) is an international auxiliary language (IAL) developed between 1937 and 1951 by the American International Auxiliary Language Association (IALA). It ranks among the most widely used IALs and is t ...

language (ISO 639-1 code) * IA – (s)

Iowa Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to th ...

(postal symbol) * IAAF – (i)

International Association of Athletics Federations World Athletics, formerly known as the International Amateur Athletic Federation (from 1912 to 2001) and International Association of Athletics Federations (from 2001 to 2019, both abbreviated as the IAAF) is the international governing body fo ...

("International Amateur Athletics Federation" from 1912 to 2001; renamed "World Athletics" in 2019) * IAAL – (i) I Am A Lawyer *

IAAS The first major provider of infrastructure as a service (IaaS) was Amazon in 2008. IaaS is a cloud computing service model by means of which computing resources are supplied by a cloud services provider. The IaaS vendor provides the storage, net ...

- (p) Infrastructure-as-a-Service * IAB – (i) International Association for Biologicals * IACREOT – (i) International Association of Clerks, Recorders, Election Officials, and Treasurers *

IAD iAd is a discontinued mobile advertising platform developed by Apple Inc. for its iPhone, iPod Touch, and iPad line of mobile devices allowing third-party developers to directly embed advertisements into their applications. iAd is part of App ...

– (i) Ion Assisted Deposition * IADS – (i) Integrated Air Defence System *

IAEA The International Atomic Energy Agency (IAEA) is an intergovernmental organization that seeks to promote the peaceful use of nuclear energy and to inhibit its use for any military purpose, including nuclear weapons. It was established in 195 ...

– (i) International Atomic Energy Agency * IAF – Industrial Areas Foundation * IAFG – (i) Information Assurance Focus Group * IAI – (i)

International African Institute The International African Institute (IAI) was founded (as the International Institute of African Languages and Cultures - IIALC) in 1926 in London for the study of African languages. Frederick Lugard was the first chairman (1926 to his death in 194 ...

–

Israel Aircraft Industries Israel Aerospace Industries (Hebrew: התעשייה האווירית לישראל ''ha-ta'asiya ha-avirit le-yisra'el'') or IAI (תע"א) is Israel's major aerospace and aviation manufacturer, producing aerial and astronautic systems for both mi ...

* IANA – (i)

Internet Assigned Numbers Authority The Internet Assigned Numbers Authority (IANA) is a standards organization that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Inte ...

IANAL IANAL is a Usenet and chat abbreviation (initialism) for the expansion "I am not a lawyer". The expansion may be used by non-lawyers who are seeking to avoid accusations of unauthorized practice of law and are not making any recommendation to the ...

– (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 Indoor air quality (IAQ) is the air quality within and around buildings and structures. IAQ is known to affect the health, comfort, and well-being of building occupants. Poor indoor air quality has been linked to sick building syndrome, reduce ...

– Infrequently Asked Questions *

IAS IAS may refer to: Science * Institute for Advanced Study, in Princeton, New Jersey, United States * Image Analysis & Stereology, the official journal of the International Society for Stereology & Image Analysis. * Iowa Archeological Society, Uni ...

– (i) Image Assessment System * IASIP – (i)

It's Always Sunny in Philadelphia ''It's Always Sunny in Philadelphia'' is an American sitcom created by Rob McElhenney and developed by McElhenney and Glenn Howerton that premiered on August 4, 2005 on FX and later FXX beginning with the ninth season in 2013. It stars Char ...

* IATA – (a/i) International Air Transport Association *

IATF The Inter-Agency Task Force for the Management of Emerging Infectious Diseases (IATF-EID) is a task force organized by the executive of the government of the Philippines to respond to affairs concerning emerging infectious diseases in the countr ...

– International Automotive Task Force *

IATSE The International Alliance of Theatrical Stage Employees, Moving Picture Technicians, Artists and Allied Crafts of the United States, Its Territories and Canada, known as simply the International Alliance of Theatrical Stage Employees (IATSE or ...

–

International Alliance of Theatrical Stage Employees The International Alliance of Theatrical Stage Employees, Moving Picture Technicians, Artists and Allied Crafts of the United States, Its Territories and Canada, known as simply the International Alliance of Theatrical Stage Employees (IATSE or ...

IAU The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach ...

– (i) International Association of Universities –

International Astronomical Union The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreac ...

* IAUC – (i) International Astronomical Union Circular * IAW – (i) In Accordance With

IB

* IB – (i)

International Baccalaureate The International Baccalaureate (IB), formerly known as the International Baccalaureate Organization (IBO), is a nonprofit foundation headquartered in Geneva, Switzerland, and founded in 1968. It offers four educational programmes: the IB D ...

* 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 The International Boxing Federation (IBF) is one of four major organizations recognized by the International Boxing Hall of Fame (IBHOF) which sanctions professional boxing bouts, alongside the World Boxing Association (WBA), World Boxing Counci ...

- International Boxing Federation * IBGe – (i)

Isobutylgermane Isobutylgermane (IBGe, Chemical formula: (CH3)2CHCH2GeH3, is an organogermanium compound. It is a colourless, volatile liquid that is used in MOVPE (Metalorganic Vapor Phase Epitaxy) as an alternative to germane. IBGe is used in the deposition o ...

IBGE The Brazilian Institute of Geography and Statistics ( pt, Instituto Brasileiro de Geografia e Estatística; IBGE) is the agency responsible for official collection of statistical, geographic, cartographic, geodetic and environmental information ...

– (i) ''Instituto Brasileiro de Geografia e Estatística'' (Portuguese, "Brazilian Institute of Geography and Statistics") * IBHOF -

International Boxing Hall of Fame The modern International Boxing Hall of Fame (IBHOF), located in Canastota, New York, honors boxers, trainers and other contributors to the sport worldwide. Inductees are selected by members of the Boxing Writers Association of America. The I ...

* IBM – (i) International Business Machines * ibo – (s)

Igbo language Igbo ( , ; Igbo: ''Ásụ̀sụ́ Ìgbò'' ) is the principal native language cluster of the Igbo people, a meta-ethnicity from Southeastern Nigeria. The number of Igboid languages depends on how one classifies a language versus a dialect, so ...

(ISO 639-2 code) *

IBRD The International Bank for Reconstruction and Development (IBRD) is an international financial institution, established in 1944 and headquartered in Washington, D.C., United States, that is the lending arm of World Bank Group. The IBRD offers l ...

– (i) International Bank for Reconstruction and Development (part of the

World Bank The World Bank is an international financial institution that provides loans and grants to the governments of low- and middle-income countries for the purpose of pursuing capital projects. The World Bank is the collective name for the Inte ...

) * IBS – (i)

Irritable Bowel Syndrome Irritable bowel syndrome (IBS) is a "disorder of gut-brain interaction" characterized by a group of symptoms that commonly include abdominal pain and or abdominal bloating and changes in the consistency of bowel movements. These symptoms may ...

IC

* IC ** (s) Ice Crystals (METAR Code) **

Iceland Iceland ( is, Ísland; ) is a Nordic island country in the North Atlantic Ocean and in the Arctic Ocean. Iceland is the most sparsely populated country in Europe. Iceland's capital and largest city is Reykjavík, which (along with its s ...

(FIPS 10-4 country code) ** (i) Integrated Circuit - nner circle* ICANN – (a)

Internet Corporation for Assigned Names and Numbers The Internet Corporation for Assigned Names and Numbers (ICANN ) is an American multistakeholder group and nonprofit organization responsible for coordinating the maintenance and procedures of several databases related to the namespaces ...

* ICAO – (i)

International Civil Aviation Organization The International Civil Aviation Organization (ICAO, ) is a specialized agency of the United Nations that coordinates the principles and techniques of international air navigation, and fosters the planning and development of international a ...

* ICBM – (i) Intercontinental Ballistic Missile * ICBM – I see (phonetically "c") BatMan *

ICBN The ''International Code of Nomenclature for algae, fungi, and plants'' (ICN) is the set of rules and recommendations dealing with the formal botanical names that are given to plants, fungi and a few other groups of organisms, all those "trad ...

– (i)

International Code of Botanical Nomenclature The ''International Code of Nomenclature for algae, fungi, and plants'' (ICN) is the set of rules and recommendations dealing with the formal botanical names that are given to plants, fungi and a few other groups of organisms, all those "trad ...

* ICC ** (i) Integrated Command and Control **

International Criminal Court The International Criminal Court (ICC or ICCt) is an intergovernmental organization and international tribunal seated in The Hague, Netherlands. It is the first and only permanent international court with jurisdiction to prosecute individuals f ...

International Cricket Council The International Cricket Council (ICC) is the world governing body of cricket. Headquartered in Dubai, United Arab Emirates, its members are 108 national associations, with 12 Full Members and 96 Associate Members. Founded in 1909 as the ' ...

** Interstate Commerce Commission **

International Chamber of Commerce The International Chamber of Commerce (ICC; French: ''Chambre de commerce internationale'') is the largest, most representative business organization in the world. Its over 45 million members in over 100 countries have interests spanning every sec ...

* ICD ** (i)

Implantable Cardioverter-Defibrillator An implantable cardioverter-defibrillator (ICD) or automated implantable cardioverter defibrillator (AICD) is a device implantable inside the body, able to perform defibrillation, and depending on the type, cardioversion and pacing of the h ...

** Initial Capabilities Document **

International Classification of Diseases The International Classification of Diseases (ICD) is a globally used diagnostic tool for epidemiology, health management and clinical purposes. The ICD is maintained by the World Health Organization (WHO), which is the directing and coordinating ...

* ICE ** (i/a) (U.S.) Immigration and Customs Enforcement ** In case of emergency * ICES – (a/i)

International Council for the Exploration of the Sea The International Council for the Exploration of the Sea (ICES; french: Conseil International de l'Exploration de la Mer, ''CIEM'') is a regional fishery advisory body and the world's oldest intergovernmental science organization. ICES is headqu ...

* ICF – (i) Intelligent Community Forum *

ICHTHYS The ichthys or ichthus (), from the Greek (, 1st cent. AD Koine Greek pronunciation: , "fish") is (in its modern rendition) a symbol consisting of two intersecting arcs, the ends of the right side extending beyond the meeting point so as to re ...

– (a) ''Iesous Christos, Theou Yios, Soter'' (

Greek Greek may refer to: Greece Anything of, from, or related to Greece, a country in Southern Europe: *Greeks, an ethnic group. *Greek language, a branch of the Indo-European language family. **Proto-Greek language, the assumed last common ancestor ...

, "

Jesus Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label= Hebrew/ Aramaic ( AD 30 or 33), also referred to as Jesus Christ or Jesus of Nazareth (among other names and titles), was a first-century Jewish preacher and religiou ...

Christ Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesus Christ or Jesus of Nazareth (among other names and titles), was a first-century Jewish preacher and religious ...

, Son of God,

Savior Savior or Saviour may refer to: *A person who helps people achieve salvation, or saves them from something Religion * Mahdi, the prophesied redeemer of Islam who will rule for seven, nine or nineteen years * Maitreya * Messiah, a saviour or l ...

") * ICM ** (i) Improved Conventional Munition ** Integrated Collection Management ** International Congress of Mathematicians **

Iraq Campaign Medal The Iraq Campaign Medal (ICM) is a military award of the United States Armed Forces which was created by Executive Order 13363 of U.S. President George W. Bush on 29 November 2004, and became available for general distribution in June 2005 ...

* 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 is an action-adventure game developed by Japan Studio and Team Ico, and published by Sony Computer Entertainment, released for the PlayStation 2 video game console in 2001 and 2002 in various regions. It was designed and directed by Fumito U ...

– (i) Intermediate Circular Orbit * ICP ** (i)

Inductively coupled plasma An inductively coupled plasma (ICP) or transformer coupled plasma (TCP) is a type of plasma source in which the energy is supplied by electric currents which are produced by electromagnetic induction, that is, by time-varying magnetic fields. Ope ...

** Insane Clown Posse * ICPE – (a/i) International Conference on Pharmacoepidemiology, the annual conference of the

International Society for Pharmacoepidemiology The International Society for Pharmacoepidemiology (ISPE) is a society focused on the practice of pharmacoepidemiology. The society was launched officially by Stanley A. Edlavitch, David E. Lilienfeld, and Hugh A. Tilson in 1989 during the Fifth I ...

* 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 (disambiguation), ICRS – (i) International Celestial Reference System * ICS (disambiguation), ICS ** (i) In-Country Support ** Intelligence and Communications Systems ** Interim Contractor Support * ICSI (disambiguation), ICSI – (p) Intracytoplasmic Sperm Injection * Information and communication technologies, ICT – (i) Information and communication technologies * ICTH – (i) Island Closest to Heaven/Hell Final Fantasy VIII * ICV (disambiguation), ICV – (i) Infantry Carrier Vehicle * ICW (disambiguation), 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) * wikt:ICYMI, ICYMI – (i) In Case You Missed It * ICZN (disambiguation), ICZN ** (i) International Code of Zoological Nomenclature ** International Commission on Zoological Nomenclature

ID

* ID (disambiguation), id – (s) Indonesian language (ISO 639-1 code) * ID (disambiguation), 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 (disambiguation), IDA ** (i) U.S. Institute for Defense Analyses ** International Development Association (part of the

* IDC (disambiguation), IDC – (i) International Data Corporation * IDDI – (i) I don't do initialisms ''(see irony)'' * IDE (disambiguation), 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 (disambiguation), IDEA ** (a) Individuals with Disabilities Education Act (U.S.) ** International Data Encryption Algorithm ** International Design Excellence Awards * IDF (disambiguation), IDF ** (i) Israel Defense Forces ** Intel Development Forum ** International Dairy Federation * IDGAF (disambiguation), IDGAF – (i) I don't give a f**k * IDK – (i) I don't know * IDKIBTI – Ebuka Obi-Uchendu, I don't know, I'm black, that's it * IDL (disambiguation), IDL – (i) Interface Definition Language * IDN (disambiguation), IDN – (s) Indonesia (ISO 3166 trigram) * ido – (s) Ido language (ISO 639-2 code) * IDR (disambiguation), IDR – (s) Indonesian rupiah (ISO 4217 currency code) * IDTS – (i) I don't think so

IE

* ''Ie (disambiguation), i.e.'' – (i) ''id est'' (Latin, roughly "that is") * Ie (disambiguation), ie – (s) Interlingue language (ISO 639-1 code) * Ie (disambiguation), IE – (i) Indo-European languages – Internet Explorer – (s) Ireland (ISO 3166 digram) – Iced Earth * IEA (disambiguation), IEA – (i) International Energy Agency * IEC (disambiguation), IEC – (i) International Electrotechnical Commission * IED (disambiguation), IED – (i) Improvised Explosive Device * IEEE – (p) Institute of Electrical and Electronics Engineers ("I triple-E") * IELTS – (a) International English Language Testing System * IER (disambiguation), IER – (i) Information Exchange Requirement * Institution of Engineering and Technology, IET – (i) Institution of Engineering and Technology * Initial Entry Training, 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 (disambiguation), IFAP – (i) International Federation of Agricultural Producers, (i) International Fashion Academy Pakistan * IFC (disambiguation), IFC – (i) International Finance Corporation (part of the

) – (a) Independent Film Channel * IFF (disambiguation), 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 (disambiguation), IFR – (i) Instrument Flight Rules * IFRB (disambiguation), IFRB – (i) International Frequency Registration Board * IFV – (i) Infantry Fighting Vehicle

IG

* IG (disambiguation), ig – (s)

(ISO 639-1 code) * IG (disambiguation), IG – (i) Inspector General * IGFA – International Game Fish Association * IGNOU – (a) Indira Gandhi National Open University * IGS (disambiguation), IGS – (i) International Ground Station * IGY (disambiguation), IGY – (i) Israeli Gay Youth – International Geophysical Year

IH

* IHÉS – (i) Institut des Hautes Études Scientifiques (French, Institute of Advanced Scientific Studies) * IHH (disambiguation), 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 (disambiguation), IHR – (i) Institute for Historical Review * IHSI – ''Institutum Historicum Societatis Iesu'' (Jesuit Historical Institute)

II

* Ii (disambiguation), ii – (s) Sichuan Yi language (ISO 639-1 code) * II (disambiguation), II – (s) 2 (number), Two (in Roman numerals) * IICA (disambiguation), IICA – (i) Inter-American Institute for Cooperation on Agriculture * IIE (disambiguation), IIE – (i) Innovative Interstellar Explorer * III (disambiguation), iii – (s) Sichuan Yi language (ISO 639-2 code) * III (disambiguation), III – (s) 3 (number), 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 (disambiguation), 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 (disambiguation), IJN – (i) Imperial Japanese Navy (World War II) * IJWP – (i) Interim Joint Warfare Publication

IK

* IK (disambiguation), 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 (disambiguation), iku – (s) (s) Inuktitut language (ISO 639-2 code)

IM

* IM (disambiguation), IM ** (s) Isle of Man (FIPS 10-4 territory code) ** (i) Instant Message (Internet speech) * IMA (disambiguation), IMA ** (i) Intermediate Maintenance Activity ** Institute of Mathematics and Applications (disambiguation), Institute of Mathematics and Applications * – (i) International Migratory Bird Day * IMDb �
Internet Movie Database
* IME - (i) In My Experience * IMF (disambuguation), IMF ** (i) IMF (file format), 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) wikt:IMHO, In My Humble/Honest Opinion, cf. #IMO, IMO *IMIST AMBO – used to facilitate an informed clinical handover between Paramedic, paramedics, emergency department staff or other Health care, healthcare similar to SBAR: Identification, Method of Injury, Index of concern, Signs, Treatment, Allergies, Medication, Background, and Other * IML (disambiguation), 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 Adverse drug reaction, ADR of statin

* IMNSHO – (i) In My Not So Humble Opinion * IMO (in my opinion) – (i) In My Opinion, also "imo", cf. #IMHO, IMHO * IMPAC – (a) International Merchant Purchase Authorization Card * Impact (disambiguation), IMPACT – (a) International Medical Products Anti-Counterfeiting Taskforce * IMPATT – (p) IMPact Avalanche Transit Time diode * IMPT – (i) Institute of Maxillofacial Prosthetists and Technologists * IMR (disambiguation), IMR – (i) ''Inzhenernaya Mashina Razgrazhdeniya'' (Russian Инженерные Машины Разграждения, "Engineer Vehicle Obstacle-Clearing"
†
* IMRI (disambiguation), 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 (disambiguation), IMRO ** Internal Macedonian Revolutionary Organization ** Irish Music Rights Organisation * IMRL – (i) Individual Material Readiness List * IMS (disambiguation), IMS ** (i) Information Management System ** International Meat Secretariat ** Ion Mobility Spectrometer * IMSA (disambiguation), IMSA ** (i) Illinois Mathematics and Science Academy ** International Mind Sports Association ** International Motor Sports Association * IMsL – (a) International Ms. Leather * IMT (disambiguation), IMT – (i) Integrated Management Tool * IMU (disambiguation), IMU – (i) International Mathematical Union

IN

* IN (disambiguation), In – (s) Indium * IN (disambiguation), IN – (s) India (FIPS 10-4 country code; ISO 3166 digram) – Indiana (postal symbol) – Infantry * INA (disambiguation), ina – (s)

language (ISO 639-2 code) * INA (disambiguation), INA – (p) Immigration and Nationality Act (disambiguation), Immigration and Nationality Act * INAS (disambiguation), INAS – (a) International Near-Earth Asteroid Survey * INC (disambiguation), INC – (i) Indian National Congress, one of the national political parties in India **(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 (disambiguation), ind – (s) Indonesian language (ISO 639-2 code) * IND (disambiguation), IND – (s) India (ISO 3166 trigram) * Inet (disambiguation), inet – (a) ''the'' Internet * 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 (disambiguation), INLA – (i) Irish National Liberation Army * INMARSAT – (p) International Maritime Satellite organization * INR (disambiguation), 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 (disambiguation), 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

IO

* IO (disambiguation), io – (s) Ido language (ISO 639-1 code) * Io (disambiguation), 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 * IOHK – Input Output Hong Kong. Redirected to Charles Hoskinson * IOLTA – (a) Interest on Lawyer Trust Accounts (charitable funding mechanism, especially for legal aid) * IOM (disambiguation), 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 (disambiguation), IOT – (s) British Indian Ocean Territory (ISO 3166 trigram) * IOT&E – (i) Initial Operational Test and Evaluation * IOU (debt), IOU – (p) "I Owe You" (Promissory note)

IP

* IP (disambiguation), IP – **(s) Clipperton Island (FIPS 10-4 territory code) **(i) Initial Point – Intellectual property, Intellectual Property – Internet Protocol * IPA (disambiguation), IPA – (i) beer, India Pale Ale – International Phonetic Alphabet – Isopropyl alcohol * IPB (disambiguation), IPB – (i) Intelligence Preparation of the Battlefield * IPCC (disambiguation), IPCC – **(i) Intergovernmental Panel on Climate Change **Independent Police Complaints Commission * ipk – (s) Inupiaq language (ISO 639-2 code) * IPL (disambiguation), IPL – (i) Inferior Parietal Lobule * IPN (disambiguation), IPN – (i) ''Instytut Pamieci Narodowej'' (Polish, "Institute for National Memory") * Initial public offering, IPO – (i) Initial public offering * IPR (disambiguation), IPR – **(i) In Progress Review **Intellectual Property Rights **Intelligence Production Requirement * IPT (disambiguation), IPT – (i) Integrated Product/Project Team * IPTS (disambiguation), IPTS – (i) Institute for Prospective Technological Studies * IPTV – (p) Internet Protocol television, Internet Protocol TeleVision * IPW – (i) Interrogation of Prisoners of War

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)

IR

* IR (disambiguation), Ir – (s) Iridium * IR (disambiguation), 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 (disambiguation), IRA ** (i) Individual retirement account ** (i) Irish Republican Army (any of several armed groups dedicated to Irish republicanism) ** Internet Research Agency (used in the Mueller report) * IRAD – (a) Internal Research and Development * IRAN - (I) Inspect and Repair As Necessary * IRAS – (p) Infrared Astronomical Satellite * IRB (disambiguation), IRB – (i) International Rugby Board, a former name of World Rugby * IRBM – (i) Intermediate Range Ballistic Missile * IRC (disambiguation), IRC ** (i) International Red Cross ** International reply coupon ** (i) Internet Relay Chat * IREA – (i) Intermountain Rural Electric Association * IRL (disambiguation), IRL ** (s) Ireland (ISO 3166 trigram) ** Industrial Research Limited ** Indy Racing League, former name of the motorsport governing body now known as INDYCAR ** (i) In real life * IRM (disambiguation), IRM ** (i) Illinois Railway Museum ** ''Inzhenernaya Razvedyvatelnaya Mashina'' (Russian Инженерная Разведывательная Машина, "Engineer Reconnaissance Vehicle"
†
* IRN (disambiguation), IRN – (s) Iran (ISO 3166 trigram) * IRINN (disambiguation), IRINN - Islamic Republic of Iran News Network * IRO (disambiguation), IRO – (i) International Refugee Organisation * IRQ (disambiguation), IRQ – (s) Iraq (ISO 3166 trigram) * IRR (disambiguation), 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

IS

* IS (disambiguation), is – (s) Icelandic language (ISO 639-1 code) * IS (disambiguation), IS ** (s)

(ISO 3166 digram) ** Israel (FIPS 10-4 country code) * ISA (disambiguation), ISA ** (i) Individual Savings Account ** Industry Standard Architecture ** instruction set, 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 (disambiguation), ISAR – (a) Inverse SAR (Synthetic Aperture Radar) * ISB (disambiguation), 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 (disambiguation), ISF – (i) Internal Security Force * ISI (disambiguation), ISI ** Indian Standards Institute, former name of the Bureau of Indian Standards ** Inter-Services Intelligence (Pakistan) ** Islamic State of Iraq, an umbrella organization for several Iraqi insurgent groups * ISIL (disambiguation), ISIL – (i/a) Islamic State, Islamic State of Iraq and the Levant * Isis (disambiguation), ISIS ** (i/a) Institute for Science and International Security ** Islamic State, Islamic State of Iraq and Syria * ISK – (s) Icelandic Icelandic króna, krona (ISO 4217 currency code) * ISL (disambiguation), isl – (s) Icelandic language (ISO 639-2 code) * ISL (disambiguation), ISL – (s)

(ISO 3166 trigram) * ISLN – **(i) International Standard Lawyer Number (used initially by LexisNexis Martindale-Hubbell) **(i) International School Libraries Network (HQ in Singapore) **(s) Isilon Systems, the NASDAQ symbol * ISM (disambiguation), ISM ** (i) Industrial, scientific or medical ** (p) Interstellar medium * ISMB – (i) International Society of Matrix Biologists * ISMC (disambiguation), ISMC – (i) Intelligent Sounding Meaningless Conversation * International Organization for Standardization, 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 Practitioner

* ISP ** (i) International Standardized Profile ** Internet Service Provider ** Information Systems Professional * ISPE (disambiguation), ISPE – (a/i)

* ISR (disambiguation), 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 (disambiguation), IST ** (i) Information System Technology ** University of Central Florida, UCF Institute for Simulation and Training * ISTAR – (i) Intelligence, Surveillance, Target Acquisition, and Reconnaissance * ISTC (disambiguation), ISTC – (i) Institute of Scientific and Technical Communications (UK) * ISTG (disambiguation), ISTG – (i) I Swear To God * ISTS (disambiguation), ISTS – (i) Intel Science Talent Search * ISU (disambiguation), ISU ** (i) Integrated Sight Unit ** International Skating Union

IT

* it – (s) Italian language (ISO 639-1 code) * IT (disambiguation), IT ** (i) InferoTemporal (neurophysiology) ** Information Technology ** (s) Italy (FIPS 10-4 country code; ISO 3166 digram) * Ita (disambiguation), ita – (s) Italian language (ISO 639-2 code) * Ita (disambiguation), 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 (disambiguation), ITC – (i) InferoTemporal Cortex (neurophysiology) * ITCZ – (i/p) Intertropical Convergence Zone * ITEC (disambiguation), ITEC – (a) Information Technology Exposition & Conference * ITEMS – (a) Interactive Tactical Environment Management System * ITER – (a) International Thermonuclear Experimental Reactor * ITF (disambiguation), ITF – (a) International Tennis Federation * ITK (disambiguation), ITK – (a) In The Know * ITN – (i) Independent Television News (British) * ITS (disambiguation), ITS ** (i) Incompatible Time-sharing System ** Individual Training Standards * ITT (disambiguation), 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)

IU

* IU (disambiguation), iu – (s) (s) Inuktitut language (ISO 639-1 code) * IUCN – (i) International Union for the Conservation of Nature and Natural Resources (World Conservation Union) * IUD – (i) Intrauterine device (https://www.plannedparenthood.org/learn/birth-control/iud) * IUI (disambiguation), IUI – (i) Intrauterine insemination (http://americanpregnancy.org/infertility/intrauterine-insemination/) * IUPAC – (a) International Union of Pure and Applied Chemistry (pronounced "eye-yoo-pac") *Indiana University – Purdue University Indianapolis, IUPUI – (a) Indiana University – Purdue University Indianapolis * IUSS (disambiguation), IUSS – (i) Integrated Undersea Surveillance System – Integrated Unit Simulation System – International Union of Soil Sciences

IV

* IV (disambiguation), IV – (s) Côte d'Ivoire (FIPS 10-4 country code; from ''Ivory Coast'') – 4 (number), Four (in Roman numerals) – (i) IntraVenous (as in intravenous drip or intravenous therapy) * IVD (disambiguation), IVD – (i) Internet Video Device, intra vas device * Iveco – (p) Industrial Vehicles Corporation * IVF – (i) In Vitro Fertilisation * IVI (disambiguation), IVI – (i) Interchangeable Virtual Instrument * IVIS – (i/a) Inter-Vehicle Information System * IVL (disambiguation), IVL – (i) Inter-Visibility Line * IVM (disambiguation), IVM – (i) In vitro maturation, In Vitro [Oocyte] Maturation * IVO – (i) In Vicinity Of

IW

* IW (disambiguation), IW – (i) Impact Wrestling * IW (disambiguation), IW – (i) Information Warfare * IWARS – (p) Infantry Warrior Simulation * IWC (disambiguation), IWC – (i) International Whaling Commission * IWT (disambiguation), IWT – (i) Illegal Wildlife Trade * IWW (disambiguation), IWW – (i) Industrial Workers of the World

IX

* Ix (disambiguation), IX – (s) 9 (number), Nine (in Roman numerals) * IXT – (s) IntraText digital library; IntraText lexical hypertext

IY

* IY (disambiguation), IY – (s) Saudi–Iraqi neutral zone (FIPS 10-4 territory code; obsolete 1993) * IYKYK – (i) If You Know You Know

IZ

* IZ (disambiguation), IZ – (s) Iraq (FIPS 10-4 country code)

References

{{DEFAULTSORT:List Of Acronyms: I Lists of acronyms, Acronyms I