RR

Look up RR or rr in Wiktionary, the free dictionary.

RR or rr may refer to:

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

Businesses and organizations

• Rashtriya Rifles, an Indian counter-insurgency force
• Rekords Rekords (logo), an American record label
• 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, a rhesus factor phenotype
• RR, abbreviation for blood pressure measurements taken with a sphygmomanometer invented by Scipione Riva-Rocci
• RR interval (R wave to R wave interval), the inverse of heart rate
• 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

Sports

• Rajasthan Royals, an Indian Premier League franchise
• Ranchi Rhinos, a defunct Hockey India League franchise

Transportation

• Railroad
• Rolls-Royce plc (LSE code and logo)
  • Rolls-Royce (disambiguation)
• 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

See also

• R&R (disambiguation)
• R (disambiguation)
• RRR (disambiguation)
• RRRR (disambiguation)