List of acronyms and initialisms (Starting with "I")

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List of acronyms and initialisms
(Starting with "I")

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the free encyclopedia,

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This list contains acronyms, initialisms, and pseudo-blends.

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)

WPA Wyoming Pipeline Authority, http://www.wyopipeline.com/

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

I

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 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

IB

IB - (i) International Baccalaureate
IBA - (i) Important Bird Area
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

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
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

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)

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

idts- i don't think so

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

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

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

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")

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)

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]

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 Honest Opinion or In My Humble 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

IN

In - (s) Indium
IN - (s) India (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

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)

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
IPHF - (i) International Public Health Forum
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

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 - (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 IRAs 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

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 ?σοσ, isos, meaning "equal")
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

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)

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

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