R is the eighteenth letter of the Latin alphabet.

R or r may also refer to:

Science

Biology and medicine

Astronomy

Physics

Temperature scales

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

Technology and engineering

Computing

Arts and entertainment

Music

Film

Television

Video games

Organisations

Transportation

Other uses

See also

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