RI

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