RR, Rr or rr may refer to:

Arts and entertainment

* ''RR'' (film), a 2007 experimental film by James Benning * Red Ribbon Army, a fictional army in the ''Dragon Ball'' series *

Ruff Ryders Entertainment Ruff Ryders Entertainment is an American hip hop record label and management company founded by siblings and record executives Joaquin "Waah", Darrin "Dee" and Chivon Dean in 1988. It operated as a subsidiary of Universal, and distributed by Int ...

, a record label and East Coast rap collective * ''

Fury from the Deep ''Fury from the Deep'' is the Doctor Who missing episodes, completely missing sixth serial of the Doctor Who (season 5), fifth season in the British science fiction television series ''Doctor Who'', which originally aired in six weekly parts from 1 ...

'' (production code: RR), a 1968 ''Doctor Who'' serial * ''RR'' (EP), a 2023 collaborative EP by Rosalía and Rauw Alejandro * RR, prefix for models of

Jackson Rhoads The Jackson Rhoads is a model of electric guitar, originally commissioned by guitarist Randy Rhoads and produced by Jackson Guitars. Origin The Concorde Randy Rhoads' first Jackson prototype was the white, pinstriped, asymmetrical Flying V ...

electric guitars commissioned by guitarist Randy Rhoads

Businesses and organizations

Rashtriya Rifles The Rashtriya Rifles (RR; ) is a counter-insurgency force in India, formed in 1990, to deal with internal security in the Jammu and Kashmir (region), Jammu and Kashmir region. They maintain public order by drawing powers from the Armed Forces ...

, an Indian counter-insurgency force *

Rational Recovery Rational Recovery (RR) was a commercial vendor of material related to counseling, guidance, and direct instruction for addiction designed as a direct counterpoint to Alcoholics Anonymous (AA) and twelve-step programs. Rational Recovery was founded ...

, an addiction recovery program *

Rekords Rekords Rekords Rekords is a record label formed by Josh Homme.Kerrang! Article, 2002 It emerged in the aftermath of the downfall of Man's Ruin Records, the record label formerly putting out Homme's project The Desert Sessions. The Desert Sessions, a com ...

(logo), an American record label *

Rhodesia Regiment The Rhodesia Regiment (RR) was one of the oldest and largest regiments in the Rhodesian Army. It served on the side of the United Kingdom in the Second Boer War and the First and Second World Wars and served the Republic of Rhodesia in the Rhodes ...

, Rhodesian Army unit *

Royal Air Force The Royal Air Force (RAF) is the Air force, air and space force of the United Kingdom, British Overseas Territories and Crown Dependencies. It was formed towards the end of the World War I, First World War on 1 April 1918, on the merger of t ...

(IATA airline designator) * Richard Rohac (logo), an Austrian art metal firm

Language

rr (digraph) This is a list of digraphs used in various Latin alphabets. In the list, letters with diacritics are arranged in alphabetical order according to their base, e.g. is alphabetised with , not at the end of the alphabet, as it would be in Danish, ...

Revised Romanization of Korean Revised Romanization of Korean () is the official Romanization of Korean, Korean language romanization system in South Korea. It was developed by the National Institute of Korean Language, National Academy of the Korean Language from 1995 and w ...

, the official Korean language romanization system in South Korea * Revised Romanization of Hangeul, the former official Hangeul language romanization system in South Korea

Science and technology

ITU Radio Regulations The ITU Radio Regulations (RR) is a basic document of the International Telecommunication Union (ITU) that regulates on law of nations scale radiocommunication services and the utilisation of radio frequencies. It is the supplementation to th ...

Rapid Refresh (weather prediction) The Rapid Refresh (RR or RAP) is a numerical weather prediction (NWP) model. The model is designed to provide short-range hourly weather forecasts for North America. The Rapid Refresh was officially made operational on 1 May 2012, replacing the ...

, a short-range numerical weather prediction model *

Rear-engine, rear-wheel-drive layout In automotive design, an RR, or rear-engine, rear-wheel-drive layout places both the engine and drive wheels at the rear of the vehicle. In contrast to the RMR layout, the center of mass of the engine is between the rear axle and the rear bum ...

, in automotive design *

Recoilless rifle A Recoilless rifle (rifled), recoilless launcher (smoothbore), or simply recoilless gun, sometimes abbreviated to "rr" or "RCL" (for ReCoilLess) is a type of lightweight artillery system or man-portable launcher that is designed to eject some fo ...

Biology and medicine

* RR, an Rh factor phenotype * "RR", a blood pressure measurement taken with a sphygmomanometer invented by

Scipione Riva-Rocci Scipione Riva Rocci (7 August 1863 in Almese, Piedmont – 15 March 1937 in Rapallo, Liguria) was an Italian internist, pathologist and pediatrician. He is best known for the invention of an easy-to-use cuff-based version of the mercury sphy ...

RR interval Heart rate is the frequency of the heartbeat measured by the number of contractions of the heart per minute (''beats per minute'', or bpm). The heart rate varies according to the body's physical needs, including the need to absorb oxygen and ex ...

(R wave to R wave interval), the inverse of heart rate *

Risk ratio The relative risk (RR) or risk ratio is the ratio of the probability of an outcome in an exposed group to the probability of an outcome in an unexposed group. Together with risk difference and odds ratio, relative risk measures the association bet ...

, or relative risk, in statistics and epidemiology *

Respiratory rate The respiratory rate is the rate at which breathing occurs; it is set and controlled by the respiratory center of the brain. A person's respiratory rate is usually measured in breaths per minute. Measurement The respiratory rate in humans is mea ...

, a vital sign *

Roundup Ready Roundup Ready is the Bayer (formerly Monsanto) trademark for its patented line of genetically modified crop seeds that are resistant to its glyphosate-based herbicide, Roundup (herbicide), Roundup. History In 1996, genetically modified ''Roundup ...

, Monsanto line of genetically modified crop seeds

Computing

Resource record The Domain Name System (DNS) is a hierarchical and distributed name service that provides a naming system for computers, services, and other resources on the Internet or other Internet Protocol (IP) networks. It associates various informatio ...

, in the Domain Name System *

Round-robin scheduling Round-robin (RR) is one of the algorithms employed by process and network schedulers in computing. Guowang Miao, Jens Zander, Ki Won Sung, and Ben Slimane, Fundamentals of Mobile Data Networks, Cambridge University Press, , 2016. As the term ...

, an algorithm for coordinating processes in an operating system *

Route reflector Border Gateway Protocol (BGP) is a standardized exterior gateway protocol designed to exchange routing and reachability information among autonomous systems (AS) on the Internet. BGP is classified as a path-vector routing protocol, and it m ...

, a Border Gateway Protocol configuration *

rr (debugging) In computing, rr is a debugging tool for Linux designed to record and replay program execution. During the replay phase, rr provides an enhanced gdb debugging experience that supports reverse execution. rr was originally developed by Mozilla ...

, a record and replay debugger for userspace Linux programs *

Resurrection Remix OS Resurrection Remix OS, abbreviated as RR, is a free and open-source operating system for smartphones and tablet computers, based on the Android mobile platform. UX designer and head developer Altan KRK & Varun Date started the project in 2012. ...

, a custom Android ROM created by Altan KRK and Varun Date

Sports

Rajasthan Royals The Rajasthan Royals, also known as RR, are a professional Twenty20 cricket team based in Jaipur, Rajasthan, that competes in the Indian Premier League (IPL). Founded in 2008 as one of the initial eight franchises, the team is owned by Manoj ...

, an Indian Premier League franchise *

Ranchi Rhinos Ranchi Rhinos was a professional field hockey team based in Ranchi, Jharkhand, that played in the Hockey India League. The team won the inaugural season of Hockey India League defeating Delhi Waveriders by 2-1. It was owned by Patel-Uniexcel Gro ...

, a defunct Hockey India League franchise *

Run rate In cricket, the run rate (RR), or runs per over (RPO), is the average number of runs a batting side scores per over. It includes all runs made by the batting side in the innings to that point of the game, both the runs scored by the batsmen an ...

, an average number of runs a batsman (or the batting side) scores in an over of 6 balls in cricket

Transportation

Raritan River Railroad The Raritan River Rail Road was a shortline railroad in Middlesex County, New Jersey, Middlesex County in the U.S. state of New Jersey, Founded in 1888, it was based in South Amboy, New Jersey, South Amboy, from which it ran west as far as Ne ...

(reporting mark: RR) *

Buzz (Ryanair) Buzz is a Polish airline headquartered in Warsaw. Formerly called Ryanair Sun, it is a subsidiary of the Irish airline company Ryanair Holdings and a sister airline to Ryanair DAC, Ryanair UK, Malta Air and Lauda Europe. Formed in 2017 and i ...

(IATA code: RR), a Polish airline subsidiary of Ryanair Holdings * Regional Road, a class of road in Ontario *

Rhodesia Railways The National Railways of Zimbabwe (NRZ), formerly Rhodesia Railways (RR), is a Bulawayo headquartered state-owned enterprise that operates the country's national railway system. It was established in 1893 and is governed by an Act of Parliament ...

, former Zimbabwean railway company *

Rhymney Railway The Rhymney Railway (RR) was a railway company in South Wales, founded to transport minerals and materials to and from Colliery, collieries and ironworks in the Rhymney Valley of South Wales, and to docks in Cardiff. It opened a main line in 18 ...

, former British railway company *

Rolls-Royce Holdings Rolls-Royce Holdings plc is a British Multinational corporation, multinational aerospace and defence company incorporated in February 2011. The company owns Rolls-Royce, a business established in 1904 which today designs, manufactures and dist ...

(LSE code and logo) **

Rolls-Royce Rolls-Royce (always hyphenated) may refer to: * Rolls-Royce Limited, a British manufacturer of cars and later aero engines, founded in 1906, now defunct Automobiles * Rolls-Royce Motor Cars, the current car manufacturing company incorporated in ...

, several companies * RR, a predecessor of the

R (New York City Subway service) The R Broadway Local is a rapid transit service in the B Division of the New York City Subway. Its route emblem, or "bullet", is colored since it uses the BMT Broadway Line in Manhattan. The R operates 24 hours daily, although service patte ...