IRR

IRR is a three-letter acronym that may refer to:

• In finance, the internal rate of return
• In computer science, Interrupt Request Register, used to indicate interrupts awaiting service
• In electrical engineering, the image rejection ratio
• In computer networking, the Internet Routing Registry
• In art conservation-restoration, Infrared reflectography
• The Individual Ready Reserve (often wrongly referred to as the "Inactive Ready Reserve") of the United States Military.
• The Iranian rial
• Iraqi Republic Railways
• The Institute of Race Relations and its newsletter, the Independent Race and Refugee News Network
• Integra Realty Resources, the largest real estate appraisal company in the U.S.
• The Australian Incident Response Regiment
• In Sheffield, England
  • Inner Ring Road
  • Inner Relief Road
• In UK Law, the Ionising Radiations Regulations 1999
• Irrlicht - graphic engine
• Ionic radius ratio

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