List of acronyms: I

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

IB

IC

ID

IE

IF

IG

IH

II

IJ

IK

IM

IN

IO
  • io – (s) Ido language (ISO 639-1 code)
  • IO – (s) British Indian Ocean Territory (ISO 3166 digram; FIPS 10-4 territory code)
  • IOC
  • IOLTA – (a) Interest on Lawyer Trust Accounts (charitable funding mechanism, especially for legal aid)
  • 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) Initial Operational Test and Evaluation
  • IOU – (p) "I Owe You" (Promissory note)

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
    • (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)
  • 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
  • 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

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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