RR
Arts and entertainment
- RR (film), a 2008 experimental film by James Benning
- Ruff Ryders Entertainment, a record label and East Coast rap collective
- Randy Rhoads (1956–1982), American guitarist
- Jackson "Randy Rhoads", electric guitar design by Randy Rhoads, Grover Jackson, and Mike Shannon
- RR, the production code for the 1968 Doctor Who serial Fury from the Deep
- The Red Ribbon Army, a fictional army in the Dragon Ball series
Businesses and organizations
- Railroad Retirement, retirement benefits railroad workers
- Rashtriya Rifles, an Indian counter-insurgency force
- 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
- ITU Radio Regulations
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
Biology and medicine
- RR, an Rh factor phenotype
- RR, abbreviation for blood pressure measurements taken with a sphygmomanometer invented by Scipione Riva-Rocci
- RR, abbreviation for the Relaxation Response, a natural autonomic response of the body induced by gently staying focused on a repetitive mental repetition of a word or phrase
- 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
Other uses in science and technology
- Rapid Refresh, a short-range numerical weather prediction model
- Rear-engine, rear-wheel-drive layout, a term used in automotive technology
- Resource record, in the Domain Name System
- Round-robin scheduling, an algorithm for coordinating processes in an operating system
- Roundup Ready, for genetically modified crops resisting to glyphosate
- 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
- Railroad
- Raritan River Railroad
- Rolls-Royce Holdings (LSE code and logo)
- RR, a predecessor of the R (New York City Subway service)
- Regional Road, a class of road in Ontario
Other uses
- Roraima (ISO 3166 code BR-RR), a state in Brazil
- Recoilless Rifle
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