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 of the United States military
• The Iranian rial
• 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 the United States Military, it stands for Individual Ready Reserve (sometimes referred to inactive ready reserve).
• In Sheffield, England
  • Inner Ring Road
  • Inner Relief Road
• In UK Law, the Ionising Radiations Regulations 1999