List of acronyms: I

(Main list of acronyms)

I – Iodine – One

I0–9

I²C or I-squared-C - Inter-Integrated Circuit
I2WD or I²WD – U.S. Intelligence and Information Warfare Directorate

IA

ia – Interlingua language
IA – Iowa
IAAF – International Association of Athletics Federations
IAAL – I Am A Lawyer
IAAS - Infrastructure-as-a-Service
IAB –
* International Association for Biologicals
* IATA code of McConnell Air Force Base
IACREOT – International Association of Clerks, Recorders, Election Officials, and Treasurers
IAD –
* Ion Assisted Deposition
* IATA code for Washington Dulles International Airport
IADS – Integrated Air Defence System
IAE - International Aero Engines
IAEA – International Atomic Energy Agency
IAF
* Industrial Areas Foundation
* Israeli Air Force
IAFG – Information Assurance Focus Group
IAI –
* International African Institute
* Israel Aircraft Industries
IANA – Internet Assigned Numbers Authority
IANAL – I Am Not A Lawyer
IAPD
*
* Investment Adviser Public Disclosure
*
IAQ – Indoor air quality – Infrequently Asked Questions
IAS – Image Assessment System
IASIP – It's Always Sunny in Philadelphia
IATA – International Air Transport Association
IATF – International Automotive Task Force
IATSE – International Alliance of Theatrical Stage Employees
IAU – International Association of Universities – International Astronomical Union
IAUC – International Astronomical Union Circular
IAW – In Accordance With

IB

IB – International Baccalaureate
IBA – Important Bird Area
IBD – Inflammatory Bowel Disease
IBDM – Information Based Decision Making
IBDS – Integrated Biological Detection System – International Business Development Specialist
IBF - International Boxing Federation
IBGe – Isobutylgermane
IBGE – Instituto Brasileiro de Geografia e Estatística
IBHOF - International Boxing Hall of Fame
IBM – International Business Machines
ibo – Igbo language
IBRD – International Bank for Reconstruction and Development
IBS – Irritable Bowel Syndrome

IC

IC
* Ice Crystals
* Iceland
* Integrated Circuit -
ICANN – Internet Corporation for Assigned Names and Numbers
ICAO – International Civil Aviation Organization
ICBM – Intercontinental Ballistic Missile
ICBM – I see (phonetically "c") BatMan
ICBN – International Code of Botanical Nomenclature
ICC
* Integrated Command and Control
* International Criminal Court
* International Cricket Council
* Interstate Commerce Commission
* International Chamber of Commerce
ICD
* Implantable Cardioverter-Defibrillator
* Initial Capabilities Document
* International Classification of Diseases
ICE
* (U.S.) Immigration and Customs Enforcement
* In case of emergency
* Internal Combustion Engine
ICES – International Council for the Exploration of the Sea
ICF – Intelligent Community Forum
ICHTHYS – Iesous Christos, Theou Yios, Soter
ICM
* Improved Conventional Munition
* Integrated Collection Management
* International Congress of Mathematicians
* Iraq Campaign Medal
ICMP – Internet Control Message Protocol
ICNAF – International Commission for the Northwest Atlantic Fisheries
ICNI – Integrated Communication, Navigation, and Identification
ICO – Intermediate Circular Orbit
ICP
* Inductively coupled plasma
* Insane Clown Posse
ICPE – International Conference on Pharmacoepidemiology, the annual conference of the International Society for Pharmacoepidemiology
ICRAF – International Centre for Research in Agroforestry
ICRISAT – International Crops Research Institute for the Semi-Arid Tropics
ICRL – Individual Component Repair List
ICRS – International Celestial Reference System
ICS
* In-Country Support
* Intelligence and Communications Systems
* Interim Contractor Support
ICSI – Intracytoplasmic Sperm Injection
ICT – Information and communication technologies
ICTH – Island Closest to Heaven/Hell Final Fantasy VIII
ICV – Infantry Carrier Vehicle
ICW
* In Co-ordination With
* Indonesia Corruption Watch
* Infectious and Chemotherapeutic Waste
* Insulating Concrete Wall
* Integral Crystalline Waterproofing
* Interactive Courseware
* International Championship Wrestling
ICYMI – In Case You Missed It
ICZN
* International Code of Zoological Nomenclature
* International Commission on Zoological Nomenclature

ID

id – Indonesian language
ID
* Idaho
* Identity
* Indonesia
* Infantry Division
* Intelligent Design
– Idiot User Error
IDA
* U.S. Institute for Defense Analyses
* International Development Association
* International Data Corporation
* "I Don't Care"
IDDI – I don't do initialisms
IDE
* Integrated Development Environment
* Integrated Drive Electronics
IDeA – Improvement and Development Agency, the former name of Local Government Improvement and Development in the United Kingdom
IDEA
* Individuals with Disabilities Education Act
* International Data Encryption Algorithm
* International Design Excellence Awards
IDF
* Israel Defense Forces
* Intel Development Forum
* International Dairy Federation
IDGAF – I don't give a f**k
IDK – I don't know
IDKIBTI – I don't know, I'm black, that's it
IDL – Interface Definition Language
IDN – Indonesia
ido – Ido language
IDR – Indonesian rupiah
IDTS – I don't think so

IE

i.e. – id est

ie – Interlingue language
IE – Indo-European languages – Internet Explorer – Ireland – Iced Earth
IEA – International Energy Agency
IEC – International Electrotechnical Commission
IED – Improvised Explosive Device
IEEE – Institute of Electrical and Electronics Engineers
IELTS – International English Language Testing System
IER – Information Exchange Requirement
IET – Institution of Engineering and Technology
IET – Initial Entry Training
IETF – Internet Engineering Task Force
IEW – Intelligence and Electronic Warfare

IF

IFAB – International Football Association Board
IFAH – International Federation for Animal Health
IFAP – International Federation of Agricultural Producers, International Fashion Academy Pakistan
IFC – International Finance Corporation – Independent Film Channel
IFF – Identification, Friend or Foe – Individually Fresh Frozen – International Flavors and Fragrances
IFFN – Identification, Friend, Foe, or Neutral
IFO – Identified Flying Object
IFOR – UN Implementation Force – Institute for Operations Research – International Fellowship of Reconciliation
IFOV – Instantaneous Field of View
IFPI – International Federation of Phonographic Industries
IFR – Instrument Flight Rules
IFRB – International Frequency Registration Board
IFV – Infantry Fighting Vehicle

IG

ig – Igbo language
IG –
* Inspector General
* Instagram
IGFA – International Game Fish Association
IGM - IATA code for Kingman Airport
IGNOU – Indira Gandhi National Open University
IGS – International Ground Station
IGY – Israeli Gay Youth – International Geophysical Year

IH

IHÉS – Institut des Hautes Études Scientifiques
IHH – Idiopathic Hypogonadotropic Hypogonadism
IHO – International Hydrographic Organization
IHOP – International House of Pancakes, the original name of this American restaurant chain
IHR – Institute for Historical Review
IHSI – ''Institutum Historicum Societatis Iesu''

II

ii – Sichuan Yi language
II – Two
IIC or I²C - Inter-Integrated Circuit
IICA – Inter-American Institute for Cooperation on Agriculture
IIE – Innovative Interstellar Explorer
iii – Sichuan Yi language
III – Three
IIMSS – If I May Say So
IIRC – If I Remember Correctly, If I Recall Correctly
IISS – International Institute for Strategic Studies
IIT – Illinois Institute of Technology – Indian Institutes of Technology – Indiana Institute of Technology
IITM – Image Institute of Technology & Management – Indian Institute of Technology Madras – Indian Institute of Tropical Meteorology
I/ITSEC – Interservice/Industry Training, Simulation and Education Conference

IJ

IJN – Imperial Japanese Navy
IJWP – Interim Joint Warfare Publication

IK

ik – Inupiaq language
IKEA – Ingvar Kamprad, Elmtaryd, Agunnaryd
iku – Inuktitut language

IM

IM
* Isle of Man
* Instant Message
IMA
* Intermediate Maintenance Activity
* Institute of Mathematics and Applications
– International Migratory Bird Day
IMDb –
IME - In My Experience
IMF
* id music file/id's music format
* Impossible Missions Force, the protagonist organization in the Mission: Impossible media franchise
* International Monetary Fund
IMHO – 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 – International Mister Leather
IMLAST – International Movement for Leisure Activities in Science and Technology – see MILSET
IMNM - - Immune-mediated necrotizing myopathy a rare, but serious ADR of statins
IMNSHO – In My Not So Humble Opinion
IMO – In My Opinion, also "imo", cf. IMHO
IMPAC – International Merchant Purchase Authorization Card
IMPACT – International Medical Products Anti-Counterfeiting Taskforce
IMPATT – IMPact Avalanche Transit Time diode
IMPT – Institute of Maxillofacial Prosthetists and Technologists
IMR – Inzhenernaya Mashina Razgrazhdeniya
IMRI
* Industrial Membrane Research Institute
* Information Management Research Institute
*
* International Market Research Information
* Intraoperative Magnetic Resonance Imaging
IMRO
* Internal Macedonian Revolutionary Organization
* Irish Music Rights Organisation
IMRL – Individual Material Readiness List
IMS
* Information Management System
* International Meat Secretariat
* Ion Mobility Spectrometer
IMSA
* Illinois Mathematics and Science Academy
* International Mind Sports Association
* International Motor Sports Association
IMsL – International Ms. Leather
IMT – Integrated Management Tool
IMU – International Mathematical Union

IN

In – Indium
IN – India – Indiana – Infantry
ina – Interlingua language
INA – Immigration and Nationality Act
INAS – International Near-Earth Asteroid Survey
INC – Indian National Congress, one of the national political parties in India
* Iglesia ni Cristo
*Indian National Congress
*International Network of Crackers
*Iraqi National Congress
INCITS – InterNational Committee for Information Technology Standards
ind – Indonesian language
IND – India
inet – the Internet
INDIGO – INtelligence DIvision Gaming Operation
INFORMS – Institute for Operations Research and the Management Sciences
INFOSEC – Information Security
INLA – Irish National Liberation Army
INMARSAT – International Maritime Satellite organization
INR – Indian rupee
INRI – Iesus Nazarenus Rex Iudæorum
INRIA – Institut national de recherche en informatique et en automatique
INS – Immigration and Naturalization Service
InSAR – Interferometric synthetic aperture radar
INST – Information Standards and Technology
in trans. – in transitu
INTSUM – Intelligence Summary
INTERFET – International Force for East Timor

IO

io – Ido language
IO – British Indian Ocean Territory
IOC
* Initial Operational Capability
* Intergovernmental Oceanic Commission
* International Olympic Committee
* International Ornithological Congress
IOG – Input Output Global. Redirected to Charles Hoskinson
IOHK – Input Output Hong Kong. Redirected to Charles Hoskinson
IOLTA – Interest on Lawyer Trust Accounts
IOM
* Iowa, Ohio, Michigan
* Institute of Medicine
* International Organisation for Migration
* Isle of Man
IONA – Islands of the North Atlantic
IoT - Internet of Things
IOT – British Indian Ocean Territory
IOT&E – Initial Operational Test and Evaluation
IOU – "I Owe You"

IP

IP –
* Clipperton Island
* Initial Point – Intellectual Property – Internet Protocol
IPA – India Pale Ale – International Phonetic Alphabet – Isopropyl alcohol
IPB – Intelligence Preparation of the Battlefield
IPCC –
* Intergovernmental Panel on Climate Change
*Independent Police Complaints Commission
ipk – Inupiaq language
IPL – Inferior Parietal Lobule
IPN – Instytut Pamieci Narodowej
IPO – Initial public offering
IPR –
* In Progress Review
*Intellectual Property Rights
*Intelligence Production Requirement
IPT – Integrated Product/Project Team
IPTS – Institute for Prospective Technological Studies
IPTV – Internet Protocol TeleVision
IPW – Interrogation of Prisoners of War

IQ

iq – idem quod
IQ –
* Intelligence Quotient
* Iraq
IQD – Iraqi dinar

IR

Ir – Iridium
IR
* Infrared
* Intelligence requirement
* Iran
* Iran Air see entry for more
IRA
* Individual retirement account
* Irish Republican Army
* Internet Research Agency
IRAD – Internal Research and Development
IRAN - Inspect and Repair As Necessary
IRAS – Infrared Astronomical Satellite
IRB – International Rugby Board, a former name of World Rugby
IRBM – Intermediate Range Ballistic Missile
IRC
* International Red Cross
* International reply coupon
* Internet Relay Chat
IREA
* Intermountain Rural Electric Association
* International Renewable Energy Alliance
* Iranian Esperanto Association
* Internet Radio Equality Act
IRGC - Islamic Revolutionary Guard Corps Ireland
* Industrial Research Limited
* Indy Racing League, former name of the motorsport governing body now known as INDYCAR
* In real life
IRM
* Illinois Railway Museum
* Inzhenernaya Razvedyvatelnaya Mashina
IRN – Iran
IRIAF - Islamic Republic of Iran Air Force
IRINN - Islamic Republic of Iran News Network
IRO – International Refugee Organization
IRQ – Iraq
IRR – Iranian rial
IRS – U.S. Internal Revenue Service
IRSN –
IRST – Infra-red Search and Track

IS

is – Icelandic language
IS
* Iceland
* Israel
ISA
* Individual Savings Account
* Industry Standard Architecture
* Instruction Set Architecture
* International Seabed Authority
ISAAA – International Service for the Acquisition of Agri-biotech Applications
ISAF
* International Sailing Federation
* International Security Assistance Force
ISAR – Inverse SAR
ISB – Intermediate Staging Base
ISBN – International Standard Book Number
ISCCP – International Satellite Cloud Climatology Project
ISCII – Indian Standard Code for Information Interchange
ISDN – Integrated Services Digital Network
ISEF – Intel International Science and Engineering Fair
ISEN – Internet Search Environment Number
ISF – Internal Security Force
ISI
* Indian Standards Institute, former name of the Bureau of Indian Standards
* Inter-Services Intelligence
* Islamic State of Iraq, an umbrella organization for several Iraqi insurgent groups
ISIL – Islamic State of Iraq and the Levant
ISIS
* Institute for Science and International Security
* Islamic State of Iraq and Syria
ISK – Icelandic krona
isl – Icelandic language
ISL – Iceland
ISLN –
* International Standard Lawyer Number
* International School Libraries Network
* Isilon Systems, the NASDAQ symbol
ISM
* Industrial, scientific or medical
* Interstellar medium
ISMB – International Society of Matrix Biologists
ISMC – Intelligent Sounding Meaningless Conversation
ISO
* In Search Of
* International Organization for Standardization
ISOGP – Indian Society of Orthodontics for General Practitioners
ISP
* International Standardized Profile
* Internet service provider
* Information Systems Professional
ISPE – International Society for Pharmacoepidemiology
ISR
* Intelligence, Surveillance and Reconnaissance
* Israel
ISRO – Indian Space Research Organisation
ISS
* International Shorebird Survey
* International Space Station
ISSCR – International Society for Stem Cell Research
ISSN – International standard serial number
IST
* Information System Technology
* UCF Institute for Simulation and Training
ISTAR – Intelligence, Surveillance, Target Acquisition, and Reconnaissance
ISTC – Institute of Scientific and Technical Communications
ISTG – I Swear To God
ISTS – Intel Science Talent Search
ISU
* Integrated Sight Unit
* International Skating Union

IT

it – Italian language
IT
* InferoTemporal
* Information Technology
* Italy
ita – Italian language
ITA – Italy
ITAG – Inertial Terrain-Aided Guidance
ITALY – I'll Truly Always Love You
ITAS – Improved Target Acquisition Sight
ITC
* Incorporated Television Company
* InferoTemporal Cortex
ITCZ – Intertropical Convergence Zone
ITEC – Information Technology Exposition & Conference
ITEMS – Interactive Tactical Environment Management System
ITER – International Thermonuclear Experimental Reactor
ITF – International Tennis Federation
ITK – In The Know
ITN – Independent Television News
ITS
* Incompatible Time-sharing System
* Individual Training Standards
ITT – International Telephone and Telegraph
ITTO – International Tropical Timber Organization
ITU
* Intent-to-Use
* International Telecommunication Union

IU

iu – Inuktitut language
IUCN – International Union for the Conservation of Nature and Natural Resources
IUD – Intrauterine device
IUI
* Indiana University Indianapolis, to be established in 2024 upon the dissolution of Indiana University–Purdue University Indianapolis
* Intrauterine insemination
IUPAC – International Union of Pure and Applied Chemistry
IUPUI – Indiana University–Purdue University Indianapolis
IUSS
* Integrated Undersea Surveillance System
* Integrated Unit Simulation System
* International Union of Soil Sciences

IV

IV – Côte d'Ivoire – Four – IntraVenous
IVD – Internet Video Device, intra vas device
Iveco – Industrial Vehicles Corporation
IVF – In Vitro Fertilisation
IVI – Interchangeable Virtual Instrument
IVIS – Inter-Vehicle Information System
IVL – Inter-Visibility Line
IVM – In vitro maturation|In Vitro Maturation
IVO – In Vicinity Of

IW

IX

IX – Nine

IY

IZ

IZ – Iraq