RR

RR, Rr or rr may refer to:

Arts and entertainment

RR (film), a 2008 experimental film by James Benning
Randy Rhoads (1956–1982), American guitarist
- Jackson "Randy Rhoads", electric guitar design by Randy Rhoads, Grover Jackson, and Mike Shannon
Rec Room (video game), a virtual reality massively multiplayer online game
The Red Ribbon Army, a fictional army in the Dragon Ball series
Ruff Ryders Entertainment, a record label and East Coast rap collective
RR, the production code for the 1968 Doctor Who serial Fury from the Deep
RR (EP), a 2023 collaborative EP by Rosalía and Rauw Alejandro

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

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

Rapid Refresh, a short-range numerical weather prediction model
Rear-engine, rear-wheel-drive layout, a term used in automotive technology
Recoilless rifle
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

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