RI
Appearance
RI or Ri may refer to:
- RI, the postal abbreviation for Rhode Island, a US state
- 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
- Referential integrity, a database concept
- 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