{{wiktionary|RI|R.I.|ri|ri-}} {{wiktionary|rí|rì|rî|-ri}} '''RI''' or '''ri''' may refer to: {{tocright}}
==People== * Ri, a common Korean surname, a variant romanization of Lee * ''Rí'' (rig), an ancient Gaelic word meaning "king" * Ri (pronoun), a gender-neutral pronoun in Esperanto *''RI'', an initialism of ''Rex Imperator'' (king-emperor) or ''Regina Imperatrix'' (queen-empress), used by those British monarchs who were rulers of both the United Kingdom and the Indian Empire
==Places== * ''Ri (administrative division)'', an administrative unit in both North Korea and South Korea * Ri, Orne, a commune of the Orne ''département'' in France * RI, abbreviation of either the Republic of Indonesia or, in the Indonesian language, ''Republik Indonesia'' * Rhode Island, a state within the US (postal abbreviation RI) * Rijeka, city in Croatia
==Arts and media== * Ri, an augmented second in solfege, used in music education * Ri, a representation of the second ''svara'' in Indian classical music * Russia Insider, a pro-Kremlin news and propaganda website
==Businesses and organizations== * Raffles Institution, a school in Singapore * Refugees International, an international humanitarian organization * Rehabilitation International, an international disability rights organization * Rotary International, international organization of business and professional leaders focused on non-political and non-sectarian humanitarian service * Royal Institution of Great Britain, an organisation devoted to scientific education and research * Royal Institute of Painters in Water Colours, a society in the Federation of British Artists * Chicago, Rock Island and Pacific Railroad (reporting mark RI) * Tigerair Mandala (IATA airline designator RI) * Italian Radicals, a political party in Italy
==Science, technology, and mathematics== * Ri (prefix symbol), a binary unit prefix symbol * Reference Intake, a food labelling system * Referential integrity, a database concept * Refractive index of an optical medium (in physics/optics) is a number that describes how light propagates through that medium * Arterial resistivity index, a measure of pulsatile blood flow * Ring Indicator, a signal in the RS232 serial communications standard * Rhombicosahedron, a polyhedron, by Bowers acronym * Residual income, a financial profitability measure of a company * Reputation Institute, a research and insights company that analyzes the reputation of corporations and places * Rapid intensification, a phenomenon in which the wind speed of a tropical cyclone increases dramatically in a short period of time * Research institute, an establishment founded for doing research
==Other uses== * Ri (cuneiform), a cuneiform sign * Ri (kana), a Romanization of the Japanese kana り and リ * ''Ri'', a unit of measurement in Japan and Korea related to the Chinese ''li'' *Rock Island District, a commuter rail line on Chicago's Metra (abbreviated as RI on maps and schedules)
==See also== {{canned search|ri}} *{{intitle|ris}} *{{intitle|ri}} *Isaac ben Samuel, known as the Ri ha-Zaken, a 12th-century French tosafist and Biblical commentator *Riri (disambiguation) *Ris (disambiguation) *IR (disambiguation)
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