RR, Rr or rr may refer to:
Arts and media RR (film), a 2007 experimental film by James Benning Red Ribbon Army, a fictional army in the Dragon Ball series Reference Reviews, a journal on reference works Ruff Ryders Entertainment, a record label and East Coast rap collective Fury from the Deep (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 electric guitars commissioned by guitarist Randy Rhoads
Businesses and organizations
Rajasthan Royals, an Indian Premier League franchise Ranchi Rhinos, a defunct Hockey India League franchise Rashtriya Rifles, an Indian counter-insurgency force Rational Recovery, an addiction recovery program Rekords Rekords, an American record label Rhodesia Regiment, a Rhodesian Army unit Richard Rohac, an Austrian art metal firm Rolls-Royce Holdings (LSE code and logo) Rolls-Royce, several companies Royal Air Force (IATA airline designator RR) Ruff Ryders Entertainment, a record label and East Coast rap collective
Language rr (digraph) Revised Romanization of Korean, the official Korean language romanization system in South Korea
Science and technology Biology and medicine RR, an Rh factor phenotype "RR", a blood pressure measurement taken with a sphygmomanometer invented by Scipione Riva-Rocci RR interval (R wave to R wave interval), the inverse of heart rate Risk ratio, or relative risk, in statistics and epidemiology Respiratory rate, a vital sign Roundup Ready, a Monsanto line of genetically modified crop seeds
Computing Resource record, in the Domain Name System Round-robin scheduling, an algorithm for coordinating processes in an operating system Route reflector, a Border Gateway Protocol configuration rr (debugging), a record and replay debugger for userspace Linux programs Resurrection Remix OS, a custom Android ROM created by Altan KRK and Varun Date
Other uses in science and technology ITU Radio Regulations Rapid Refresh (weather prediction), a short-range numerical weather prediction model Rear-engine, rear-wheel-drive layout, in automotive design Recoilless rifle
Sports Rajasthan Royals, an Indian Premier League franchise Ranchi Rhinos, a defunct Hockey India League franchise Richmond Raceway, a motorsports racetrack in Richmond, Virginia Run rate, an average number of runs a batsman (or the batting side) scores in an over of 6 balls in cricket
Transportation Transport operators and services RR, a predecessor of the R (New York City Subway service) Raritan River Railroad (reporting mark: RR) Buzz (Polish airline) (IATA code: RR), a Polish airline subsidiary of Ryanair Holdings Rhodesia Railways, former Zimbabwean railway company Rhymney Railway, former British railway company Royal Air Force (IATA airline designator RR)
Other uses in transportation Regional Road, a class of road in Ontario Rolls-Royce Holdings (LSE code and logo) Rolls-Royce, several companies
See also Roraima (ISO 3166 code: BR-RR), a state in Brazil Railroad Retirement Board (RRB), retirement benefits railroad workers R&R (disambiguation) R (disambiguation) RRR (disambiguation) RRRR (disambiguation)