RI (disambiguation)

RI is the postal abbreviation for Rhode Island, an American state.

RI or Ri may also refer to:

• Ri, a common Korean surname
• Ri (administrative division), an administrative unit in both North Korea and South Korea
• Ri (kana), a Romanization of the Japanese kana り and リ
• Ri, Orne, a commune of the Orne département, in France
• Rí, the ancient Gaelic word meaning King
• Raffles Institution, a school in Singapore
• Refugees International, an international humanitarian organization
• Rehabilitation International, an international disability rights organization
• Arterial resistivity index
• Rex Imperator or Regina Imperatrix, a suffix used by British monarchs as Emperors of India
• Ring Indicator, a signal in the RS232 serial communications standard
• Rotary International
• Royal Institution of Great Britain
• Royal Institute of Painters in Water Colours, a society in the Federation of British Artists
• Chicago, Rock Island and Pacific Railroad's reporting mark
• Mandala Airlines's IATA airline designator
• Rhombicosahedron's Bowers acronym
• Refractive index of an optical medium (in physics/optics) is a number that describes how light propagates through that medium
• Ri, an augmented second in Solfege
• Ri, a representation of the second Swara in Indian classical music
• Ri, a proposed gender-neutral pronoun for Gender reform in Esperanto
• Republic of Indonesia, or, in Indonesian language, "Republik Indonesia"
• Ri, a unit of measurement in Japan and Korea

See also

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