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
Jackson "Randy Rhoads", electric guitar design by Randy Rhoads, Grover Jackson, and Mike Shannon

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 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
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
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

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