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R is the eighteenth letter of the Latin alphabet.


R may also refer to:


  • The set of all real numbers, often written as \Bbb{R} or R
  • The Pearson product-moment correlation coefficient r in statistics
  • R (programming language), an environment for statistical computing and graphics
  • R (complexity), the set of all recursive languages
  • R, RequestBot, a service in QuakeNet's IRC services
  • IBM System R, an IBM database system
  • R-value (insulation), a non-SI measure of thermal resistance used in housing insulation
  • R-value (soils), property of soils used in pavement design
  • An electronic resistor, e.g. in circuit diagrams
  • The R-# refrigerant numbering system
  • In fracture mechanics, the ratio between the minimum and maximum stresses
  • The spectral resolution in astronomy
  • The symbol given to the molar gas constant in chemistry
  • A stellar classification for orangish or K carbon stars
  • R (cross section ratio), the ratio of hadronic to muonic cross sections
  • Roentgen (unit), a unit of measurement for ionizing radiation such as X-ray and gamma rays
  • The Rydberg constant, a physical constant relating to energy levels of electrons within atoms
  • R, a label that denotes one of two chiral center configurations in the R/S system
  • A side chain (an unspecified group of atoms) in a chemical or structural formula
  • Arginine, an amino acid
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8y ago
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8y ago

It means Registered Trade mark It means Registered Trade mark It means Registered Trade mark

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Q: What does R mean?
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