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List of acronyms: 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 if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
  • initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
  • pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).
(a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome
(i) = initialism, e.g.: CD – (i) compact disc
(p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women
(s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – Megahertz)

(Main list of acronyms)


  • 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 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
  • 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
  • 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

IC

ID

IE

IF

IG

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

IJ

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

IN

IO

IP

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

IS

IT

  • it – (s) Italian language (ISO 639-1 code)
  • IT
  • 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)
  • ITCZ – (i/p) Intertropical Convergence Zone
  • 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

IU

IV

IW

IX

  • IX – (s) Nine (in Roman numerals)
  • IXT – (s) IntraText digital library; IntraText lexical hypertext

IY

  • IY – (s) Saudi–Iraqi neutral zone (FIPS 10-4 territory code; obsolete 1993)

IZ

  • IZ – (s) Iraq (FIPS 10-4 country code)
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