What does R mean?

Answer 1

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

Answer 2

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