IRR or Irr may refer to:

Finance

Implied repo rate Implied repo rate (IRR) is the rate of return of borrowing money to buy an asset in the spot market and delivering it in the futures market where the notional is used to repay the loan. Simplified closed form IRR = \left( \frac \text \text -1 ...

, in the futures market *

Internal rate of return Internal rate of return (IRR) is a method of calculating an investment’s rate of return. The term ''internal'' refers to the fact that the calculation excludes external factors, such as the risk-free rate, inflation, the cost of capital, or fin ...

, a profitability metric *

Iranian rial The rial ( fa, ریال ایران, riyâl-è Irân; sign: ﷼; abbreviation: Rl (singular) and Rls (plural) or IR in Latin; ISO code: IRR) is the official currency of Iran. There is no official symbol for the currency but the Iranian standar ...

, currency of Iran by ISO 4217 code *

Interest rate risk In finance and economics, interest is payment from a borrower or deposit-taking financial institution to a lender or depositor of an amount above repayment of the principal sum (that is, the amount borrowed), at a particular rate. It is distinc ...

, financial risk from fluctuating interest rates

Organisations

* Incident Response Regiment (Australia), an emergency response agency *

Institute of Race Relations The Institute of Race Relations (IRR) is a think tank based in the United Kingdom. It was formed in 1958 in order to publish research on race relations worldwide, and in 1972 was transformed into an "anti-racist think tank". Proposed by ''Sund ...

, a policy institute *

Institute for Religious Research The Institute for Religious Research (IRR) is an American Christian apologetics and counter-cult organization based in Cedar Springs, Michigan. It declares itself to be a non-denominational, non-profit Christian foundation for the study of rel ...

, an apologetics organization *

Iraqi Republic Railways Iraqi Republic Railways Company (IRR; ar, الشركة العامة لسكك الحديد العراقية) is the national railway operator in Iraq. Network IRR comprises of . IRR has one international interchange, with Chemins de Fer Syrien ...

, a transportation operator *

South African Institute of Race Relations Established in 1929,http://www.sairr.org.za/profile/ the South African Institute of Race Relations (SAIRR) is a research and policy organisation in South Africa. The institute is "one of the oldest liberal institutions in the country". The in ...

, a think tank

Science and technology

Image rejection ratio Image response (or more correctly, image response rejection ratio, or IMRR) is a measure of performance of a radio receiver that operates on the superheterodyne principle. In such a radio receiver, a local oscillator (LO) is used to heterodyne ...

, a radio metric * Interrupt Request Register, a register used for managing interrupts in programmable interrupt controllers *

Internet Routing Registry An Internet Routing Registry (IRR) is a database of Internet route objects for determining, and sharing route and related information used for configuring routers, with a view to avoiding problematic issues between Internet service providers. The ...

, a network routing database *

Irregular galaxy An irregular galaxy is a galaxy that does not have a distinct regular shape, unlike a spiral or an elliptical galaxy. Irregular galaxies do not fall into any of the regular classes of the Hubble sequence, and they are often chaotic in appearanc ...

, a galaxy that does not have a distinct regular shape

Other

Incidence rate ratio In epidemiology, a rate ratio, sometimes called an incidence density ratio or incidence rate ratio, is a relative difference measure used to compare the incidence rates of events occurring at any given point in time. It is defined as: : \text = \ ...

, a statistic derived from a Poisson regression model *

Individual Ready Reserve The Individual Ready Reserve (IRR) is a category of the Ready Reserve of the Reserve Component of the Armed Forces of the United States composed of former active duty or reserve military personnel. Its governing statute is codified at . For soldi ...

, a personnel status of the United States Military * Infusion-related reaction or infusion reaction, a form of systemic inflammatory response syndrome caused by some diseases or drugs * Inner Ring Road (disambiguation) *

Inter-rater reliability In statistics, inter-rater reliability (also called by various similar names, such as inter-rater agreement, inter-rater concordance, inter-observer reliability, inter-coder reliability, and so on) is the degree of agreement among independent obse ...

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