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RI or Ri may refer to:

Arts and media[edit]

  • Ri, an augmented second in Solfege, in music education
  • Ri, a representation of the second Swara in Indian classical music
  • Russia Insider, a news website

Businesses and organizations[edit]



Science, technology, and mathematics[edit]

Other uses[edit]

  • Ri, a common Korean surname (a variant of Lee)
  • Rex Imperator or Regina Imperatrix, a suffix used by British monarchs as Emperors of India
  • Ri, a unit of measurement in Japan and Korea

See also[edit]

  • Isaac ben Samuel or the Ri ha-Zaken, a 12th-century French tosafist and Biblical commentator