RR may stand for: Rachael Ray, an American television personality Railroad Rashtriya Rifles, Indian counter-insurgency force Rational Recovery Reach Records, a Christian hip hop record label Reading Rainbow, an American children's television program Rear-engine, rear-wheel drive layout, in automotive terminology Regional Railways, a former sector of British Rail Repurchase agreement rate (or repo rate; as in the Reuters Instrument Code US10YT=RR) Request-response, a synchronous messaging model commonly used in distributed computer systems Relative risk in statistics and epidemiology Rescue Rangers, a rescue organization headed by Chip 'n Dale and the TV series named for it Respiratory rate as a vital sign Revised Romanization of Korean Rhesus factor Rio Rancho Riva Rocci, an abbreviation for blood pressure measured with a specific sphygmomanometer Road Rules, a reality series on MTV Road Runner Rolls-Royce Roman Republic Ronald Reagan, former President of the United States of America

Source: http://en.wikipedia.org/wiki/RR
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