R (disambiguation)

R, or r, is the eighteenth letter of the English alphabet.

R or r may also refer to:

Science Biology and medicine Arginine, an amino acid abbreviated as Arg or R ATC code R Respiratory system, a section of the Anatomical Therapeutic Chemical Classification System Coefficient of relationship (r), in biology Effective reproduction number (R), the number of cases generated by one case in the current state of a population in epidemiology Basic reproduction number (R0), the expected number of cases directly generated by one case Haplogroup R (mtDNA), a human mitochondrial DNA (mtDNA) haplogroup Haplogroup R (Y-DNA), a Y-chromosomal DNA (Y-DNA) haplogroup Net reproduction rate (R0), the average number of offspring that would be born to a female given conforming conditions r, the population growth rate in the r/K selection theory of ecology

Astronomy Spectral resolution (), in astronomy Orangish or K carbon stars (stellar classification: R)

Physics R (cross section ratio), the ratio of hadronic to muonic cross sections Electrical resistance (R) Roentgen (unit) (R), a unit of measurement for ionizing radiation such as X-ray and gamma rays Rydberg constant (R∞, RH), a physical constant relating to energy levels of electrons within atoms Rydberg unit of energy (Ry), the energy of the photon whose wavenumber is the Rydberg constant

Temperature scales Rankine scale (°R, °Ra) Réaumur scale (°Ré, °Re, °r) Rømer scale (°R, °Rø)

Chemistry Gas constant (R), in chemistry (R), one of two chiral center configurations in the R/S system Alkyl group, commonly marked as R in structural formulas Side chain (an unspecified group of atoms), in a chemical or structural formula

Mathematics r is the symbol for the radius of a circle or R, the set of all real numbers Pearson product-moment correlation coefficient (r), in statistics R (programming language), an environment for statistical computing and graphics Ricci curvature , the gamma function

Technology and engineering R-value (insulation), a non-SI measure of thermal resistance used in housing insulation R-value (soils), property of soils used in pavement design Resistor, an electronic component R-, a refrigerant numbering system R, the ratio between the minimum and maximum stresses in fracture mechanics R- or recall-button, now mostly used to switch between two calls

Computing R (programming language), an environment for statistical computing and graphics R (complexity), the set of all recursive languages IBM System R, an IBM database system RequestBot, a service in QuakeNet's IRC services

Arts and entertainment Music Ritardando, a term for slowing the tempo down gradually R. (R. Kelly album), a 1998 album by R. Kelly R° (Ruratia album), a 2002 album by Rurutia R (single album), a 2021 single album by Rosé Rated R (Queens of the Stone Age album), 2000 album also called R R (jp), 2005 J-Pop album by Ryoko Shiraishi

Film R (film), a 2010 film by Danish screenwriter and film director Tobias Lindholm R, a character played by John Cleese in The World Is Not Enough R, the protagonist of Warm Bodies, based on the book of the same name R, a film rating in the Motion Picture Association of America film rating system and in the Canadian Home Video Rating System

Television Rajawali Televisi (RTV), television in Indonesia R, the production code for the 1965 Doctor Who serial The Chase

Video games R·Type, an arcade video game R: Rock'n Riders, in the list of PlayStation games (M–Z)

Organisations The Crown, Rex (King) or Regina (Queen) in Commonwealth nations Ryder (NYSE ticker symbol) R (cable operator), a telecommunications company R, denoting a member of the US Republican Party

Transportation Nissan Skyline GT-R, commonly referred to as the "R" among Japanese speakers R (New York City Subway service) Rinkai Line, a railway line operated by the Tokyo Waterfront Area Rapid Transit, labeled Transilien Line R, a line of the Paris transport network Reconnaissance aircraft (military designation: R) Restricted airspace Volkswagen R, the performance division of Volkswagen The official West Japan Railway Company service symbol for: Hanwa Line. San'yō Main Line. Raipur Junction railway station (Indian Railways station code: R), Chhattisgarh, India Banyumas, Cilacap, Purbalingga and Banjarnegara (vehicle registration prefix R) Taipei Metro's Tamsui-Xinyi line (metro line prefix R)

Other uses Registered trademark symbol (®) South African rand (R), a currency Right (direction) Rolled R (IPA: r), the alveolar trill of Spanish, Italian, & Arabic languages ʀ, symbol for transliteration of the Younger Futhark rune ᛦ ʀ, the voiced uvular trill UTC−05:00 (military time zone code: Romeo) Я, a Cyrillic letter similar to R Subreddit, user-created areas of interest where discussions on Reddit are organized.

R (disambiguation)

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