RR

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, 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

• Rashtriya Rifles, an Indian counter-insurgency force
• Rational Recovery, an addiction recovery program
• Rekords Rekords (logo), an American record label
• Rhodesia Regiment, Rhodesian Army unit
• Royal Air Force (IATA airline designator)
• Richard Rohac (logo), an Austrian art metal firm

Language

• rr (digraph)
• Revised Romanization of Korean, 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
• Rapid Refresh (weather prediction), a short-range numerical weather prediction model
• Rear-engine, rear-wheel-drive layout, in automotive design
• Recoilless rifle

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, 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

Sports

• Rajasthan Royals, an Indian Premier League franchise
• Ranchi Rhinos, a defunct Hockey India League franchise
• Run rate, an average number of runs a batsman (or the batting side) scores in an over of 6 balls in cricket

Transportation

• Raritan River Railroad (reporting mark: RR)
• Buzz (Ryanair) (IATA code: RR), a Polish airline subsidiary of Ryanair Holdings
• Regional Road, a class of road in Ontario
• Rhodesia Railways, former Zimbabwean railway company
• Rhymney Railway, former British railway company
• Rolls-Royce Holdings (LSE code and logo)
  • Rolls-Royce, several companies
• RR, a predecessor of the R (New York City Subway service)

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)