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 (; symbol: ; abbreviation: Rl (singular) and Rls (plural) or IR in Latin; ISO code: IRR) is the official currency of Iran. It is subdivided into 100 dinars, but due to the rial's low purchasing power the dinar is not practically used. ...

, currency of Iran by ISO 4217 code *

Interest rate risk Interest rate risk is the risk that arises for bond owners from fluctuating interest rate An interest rate is the amount of interest due per period, as a proportion of the amount lent, deposited, or borrowed (called the principal sum). The ...

, 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 relig ...

, an apologetics organization *

Iraqi Republic Railways Iraqi Republic Railways Company (IRR; ) is the national railway operator in Iraq. Network IRR comprises of . IRR has one international interchange, with Chemins de Fer Syriens (CFS) at Rabia, Iraq, Rabiya. The system runs from Rabiya southw ...

, a transportation operator *

South African Institute of Race Relations The South African Institute of Race Relations (IRR) is a research and policy organisation in South Africa. The IRR was founded in 1929 to improve and report upon race relations in South Africa between the politically dominant White South Africa ...

, 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 In computing, a programmable interrupt controller (PIC) is an integrated circuit that helps a microprocessor (or CPU) handle interrupt requests (IRQs) coming from multiple different sources (like external I/O devices) which may occur simultaneo ...

, 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 appearan ...

, 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 = \f ...

, 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 sold ...

, a personnel status of the United States Military *

Infusion-related reaction In immunology, cytokine release syndrome (CRS) is a form of systemic inflammatory response syndrome (SIRS) that can be triggered by a variety of factors such as infections and certain drugs. It refers to cytokine storm syndromes (CSS) and occurs ...

or infusion reaction, a form of systemic inflammatory response syndrome caused by some diseases and 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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