All articles starting with R
22,461 articles
Reuleaux triangle
The Reuleaux triangle, named for Franz Reuleaux, is a curve of constant width built from an equilateral triangle, and it has the smallest area of any constant-width curve.
Reull Vallis
Reull Vallis is a ~1,052 km segmented outflow channel on Mars, originating in Hesperia Planum near the Hellas basin rim; named by the IAU in 1979 from the Gaelic word for "planet".
Reumatismo
Reumatismo (Italian rheumatology journal, founded 1949) is the official journal of the Italian Society of Rheumatology, published quarterly by PAGEPress, MEDLINE-indexed, ISSN 0048-7449, 2025 impact factor 1.2.
Reunification of the Hafsid state (1370)
The reunification of the Hafsid state (توحيد الدولة الحفصية) was the restoration of unified Hafsid rule over Ifriqiya by Abu al-Abbas Ahmad, who took Tunis in 1370 after civil war and Marinid invasion.
Reunification of the Uniates of 1839
The Reunification of a Uniates of a 1849 was the incorporation of the Greek Catholic Uniates of the Belarusian and Lithuanian eparchies into Russian Orthodoxy, decided in 1839.
Reunification of Vietnam
The reunification of Vietnam merged communist North Vietnam and South Vietnam into the Socialist Republic of Việt Nam on 2 July 1976, after the fall of Saigon in 1975.
Réunion
Réunion: French overseas department and region and EU Outermost Region, a Mascarene island 600 km east of Madagascar; 889,679 people (2023), GDP €23.2 billion, poverty 36%, active Piton de la Fournaise volcano.
Reunion (British TV series)
Reunion is a 2025 four-part BBC One thriller by deaf writer William Mager, produced by Warp Films, starring Matthew Gurney as Daniel Brennan, a deaf ex-prisoner seeking truth; bilingual BSL and English, set in Sheffield and the Peak District.
Reunion Arena
Reunion Arena was a city-owned indoor arena in downtown Dallas, Texas, open 1980-2008, home of the Dallas Mavericks and Dallas Stars, site of the 1984 Republican National Convention and a Katrina shelter, demolished in 2009.
Reunion Infrastructure
Reunion Infrastructure is a San Francisco startup founded in 2022 by Andy Moon and Billy Lee that operates a marketplace for clean energy tax credits.
REUNIR study
REUNIR (NCT03831035) was the first French study of rapid trio exome sequencing in 15 infants under 12 months in intensive care at Montpellier, reporting 86% of results within 16 days and a 40% diagnostic yield.
Reunited Worlds (다시 만난 세계)
Reunited Worlds (다시 만난 세계, Into the New World) is a 2017 SBS Wednesday-Thursday fantasy romance drama by Lee Hee-myung and Baek Soo-chan, 40 episodes, starring Yeo Jin-goo, Lee Yeon-hee, and Ahn Jae-hyun; aired July 19 to September 21, 2017.
Reus
Reus, capital of Baix Camp in Camp de Tarragona, Catalonia, Spain; a city of about 111,600 inhabitants (2025), birthplace of Antoni Gaudí, with nearly 80 modernist buildings, Reus Airport, and a documented history from 1154.
Reusability (launch vehicles)
Reusability in launch vehicles is the practice of recovering and reflying rocket hardware like the first stage, pioneered by the Space Shuttle and made routine by SpaceX's Falcon 9.
Reusable spacecraft
A reusable spacecraft is a space vehicle designed to fly multiple missions, recovering its hardware instead of discarding it, ranging from the Space Shuttle to SpaceX's Falcon 9 and Starship.
Reusable Vehicle Testing
Reusable vehicle testing is the sequence of ground and flight campaigns proving reusable launch vehicles can survive launch, reentry, landing, and reflight, tracing to NASA's 1990s demonstrators.
Reuse
Reuse is using a product again for its original purpose without turning it into waste; in the waste hierarchy it sits above recycling because the whole product stays in service.
Reuter Concession
The Reuter Concession (امتیاز رویتر) was an 1872 grant by Naser al-Din Shah of Qajar Iran to Baron Julius de Reuter, giving him rights over Iran's resources, canceled in 1873.
Reuters
Reuters: global news agency founded in London in 1851 by Paul Julius Reuter (born Israel Beer Josaphat), pioneer of pigeon-post and telegraph news delivery, governed since 1941 by the Trust Principles and now part of Thomson Reuters.
Reutlingen
Reutlingen is a large district town in Baden-Württemberg, Germany, near the Swabian Alb, a former Free Imperial City with about 117,000 inhabitants, an industrial and university city, and home of the world's narrowest street.
Reuven Agami
Reuven Agami is a molecular biologist who heads the Division of Oncogenomics at the Netherlands Cancer Institute in Amsterdam, known for identifying miR-372/373 oncogenes and developing the pSUPER RNAi vector.
Reuven Rivlin
Reuven Rivlin (ראובן ריבלין), tenth President of Israel 2014-2021, Likud politician, two-term Knesset Speaker, author of the 2015 'Tribes Speech' on Israel's four sectors.
Reuyl (Martian crater)
Reuyl is an impact crater on Mars, about 85 km in diameter, located between Aeolis Dorsa and Apollinaris Mons and studied for its long record of fluvial activity.
Rev neurol
Rev Neurol is an NLM journal abbreviation shared by two neurology journals: Revista de neurologia (Spain, founded 1972, ISSN 0210-0010) and Revue Neurologique (Paris, founded 1893, ISSN 0035-3787, official journal of the Société Française de Neurologie).
Rev-9
The Rev-9 is a fictional Terminator model played by Gabriel Luna in Terminator: Dark Fate (2019), combining a metal endoskeleton with a liquid metal exterior.
REVA University
REVA University is a state private university in Yelahanka, Bengaluru, established under Karnataka Act No. 13 of 2013 by the Rukmini Educational Charitable Trust, with a 45-acre campus, over 15,000 students, NAAC A+ grade, and QS I-Gauge Diamond rating.
Revaia
Revaia, formerly Gaia Capital Partners, is a Paris-based European growth-equity firm founded by Alice Albizzati and Elina Berrebi, with €600 million under management as of 2025.
Revakinagene taroretcel lwey
Revakinagene taroretcel-lwey (ENCELTO, NT-501) is a Neurotech Pharmaceuticals encapsulated cell gene therapy implant releasing CNTF, FDA-approved March 5, 2025 as the first treatment for adults with idiopathic macular telangiectasia type 2.
Revalesio Corp
Revalesio Corp is a privately held, clinical-stage biopharmaceutical company based in Tacoma, Washington, developing RNS60, an oxygen-supersaturated saline studied as an adjunctive therapy for acute ischemic stroke.
Revaluation
Revaluation is an official government increase in a currency's exchange value under a fixed exchange rate regime, typically when an undervalued currency generates persistent balance-of-payments surpluses.