RR

RR may stand for:

Medicine

*Reference range, in laboratory medicine.
*Relative risk, in statistics and epidemiology
*Respiratory rate, as a vital sign
*Rhesus factor, in immunohematology.

Media

*Reading Rainbow, an American children's television program
*Rescue Rangers, a rescue organization headed by Chip 'n Dale and the TV series named for it
*Royal Rumble, annual WWE pay-per-view
*Rocka Rolla, heavy metal album by Judas Priest
*Road Rules, a reality series on MTV

People

*Rachael Ray, an American television personality
*Robert Reiner, actor
*Ronald Reagan, 40th President of the United States of America

Organizations

*Rajasthan Royals, an Indian Premier League franchise
*Reach Records, a Christian hip hop record label
*Rashtriya Rifles, Indian counter-insurgency force
*Rekords Rekords, an American record label founded by Josh Homme
*Regional Railways, a former sector of British Rail
*Red Rooster, an Australian fast food chain.
*Rapid Ride, a bus rapid transit system in Albuquerque, New Mexico
*Road Runner (ISP)
*Royal Air Force, IATA airline designator

Technology

*Railroad
*Rational Recovery
*RR layout, Rear-engine, rear-wheel drive layout, in automotive terminology
*Request-response, a synchronous messaging model commonly used in distributed computer systems
*Domain Name System resource record (RR) used in DNS Zone files
*Riva Rocci, an abbreviation for blood pressure measured with a specific sphygmomanometer
*Round-robin scheduling

Other

*Rio Rancho
*Royal Road
*rr (digraph)
*Rural route
*Russian ruble
*Rolls-Royce (disambiguation)
*Repurchase agreement rate (or repo rate; as in the Reuters Instrument Code "US10YT=RR")
*Roman Republic
*Revised Romanization of Korean