RI
Look up RI, R.I., ri, or ri- in Wiktionary, the free dictionary. |
Look up rí, rì, rî, or -ri in Wiktionary, the free dictionary. |
RI or ri may refer to:
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 news 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)
- TVRI (Televisi Republik Indonesia), a state-owned, public broadcasting television network in Indonesia
- Tigerair Mandala (IATA airline designator RI)
Terms from other languages
- Rí, an ancient Gaelic word meaning "king"
- Ri (kana), a Romanization of the Japanese kana り and リ
- Ri, a proposed gender-neutral pronoun for gender reform in Esperanto
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)
Science, technology, and mathematics
- 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
Other uses
- Ri, a common Korean surname, a variant romanization of Lee
- 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
- Ri, a unit of measurement in Japan and Korea related to the Chinese li
See also
- Isaac ben Samuel, known as the Ri ha-Zaken, a 12th-century French tosafist and Biblical commentator
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