List of Acronyms and Initialisms: I - 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 organisations known as the Irish Republican Army for groups claiming descent from this organisation)
  • IRAD – (a) Internal Research and Development
  • 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 – In real life
  • IRM – (i) Illinois Railway Museum – Inzhenernaya Razvedyvatelnaya Mashina (Russian Инженерная Разведывательная Машина, "Engineer Reconnaissance Vehicle") †
  • IRN – (s) Iran (ISO 3166 trigram)
  • IRINN - Islamic Republic of Iran News Network
  • 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

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