All articles starting with R
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Round-robin scheduling
Round-robin scheduling is a preemptive scheduling method in which each task runs for a fixed time quantum, then returns to the back of the ready queue for another turn.
Round-robin tournament
Round-robin tournament: all-play-all competition format where each of n teams meets every other once (single) or twice (double), needing n(n−1)/2 matches, n−1 or n rounds, byes for odd fields.
Round-trip efficiency
Round-trip efficiency is the percentage of energy put into a storage system that comes back out over a full charge-discharge cycle, from about 90% for lithium-ion to 30% for hydrogen.
Round2hell
Round2hell (R2H) is an Indian Hindi-language comedy YouTube channel from Moradabad, Uttar Pradesh, run by the trio Zayn Saifi, Nazim Ahmed, and Wasim Ahmad since 20 October 2016, with about 36.5 million subscribers, 3.8 billion views across 69 videos, and the 2021 trending hit Zombie: The Living Dead.
Roundabout
A roundabout, also called a traffic circle, is a circular intersection where entering traffic yields to traffic circulating at reduced speed around a central island, reducing crashes.
Roundel
A roundel is a circular national insignia of concentric colored rings painted on military aircraft to show nationality, borrowed from heraldry and first adopted by France in 1912.
Rounder Records
Rounder Records, founded 1970 in Somerville, Massachusetts by Ken Irwin, Marian Leighton Levy, and Bill Nowlin, is a historic American independent roots-music label (bluegrass, folk, blues) with 3,000+ titles, home of Alison Krauss, sold to Concord in 2010, now Nashville-based.
Rounders
Rounders, also called Irish rounders, is a bat-and-ball team game of English origin, played chiefly in Britain and Ireland, and long described as a source of baseball.
Rounders (film)
Rounders is a 1998 American drama directed by John Dahl, written by Koppelman and Levien, starring Matt Damon and Edward Norton as underground New York poker players; a box office disappointment that became a cult classic credited with fueling the poker boom.
Roundhay Garden Scene
Roundhay Garden Scene is a roughly two-second 1888 film by Louis Le Prince, shot at Oakwood Grange, Roundhay, Leeds, showing Adolphe Le Prince, Sarah Whitley, Joseph Whitley, and Harriet Hartley; the oldest surviving film.
Roundhead
Roundhead, the nickname for the English Parliamentarians, was first recorded as an insult in late 1641, deriding the close-cropped hair of Puritans against the long ringlets of Royalist Cavaliers.
Roundhouse (venue)
The Roundhouse, Camden, London: a Grade II listed 1846-7 railway turntable engine shed on Chalk Farm Road, later a Gilbey gin warehouse, 1960s rock venue (Pink Floyd, Hendrix), closed 1983, reopened 2006 after £30m rebuild with 3,300 standing capacity.
Rounding
Rounding is the replacement of a number with a nearby value that has a shorter, simpler representation, such as an integer or fewer decimal digits, following a rounding rule.
Roundtable Healthcare Partners
RoundTable Healthcare Partners is a Lake Forest, Illinois private equity firm founded in 2001 that invests only in healthcare companies, with $3.45 billion in committed capital.
Roundtable on Sustainable Biomaterials
The Roundtable on Sustainable Biomaterials, or RSB, is a Swiss-based multi-stakeholder organization founded in 2007 that certifies bio-based products, and is an ICAO-recognized scheme for CORSIA-eligible sustainable aviation fuel.
Roundtable on Sustainable Palm Oil
The Roundtable on Sustainable Palm Oil is a voluntary, nonprofit multi-stakeholder association founded in Switzerland in 2004 that sets global standards for certified sustainable palm oil, including no-deforestation rules.
Roundtop
Roundtop (Roundtop Mountain) is an eroded, glaciated stratovolcano on Unimak Island, Alaska, 13 km from False Pass; 1,871 m high, with a VEI 5 caldera-forming eruption around 7600 BCE and no historical eruptions.
Roundup (herbicide)
Roundup, the Monsanto (now Bayer) glyphosate herbicide launched in 1974; inhibits EPSP synthase; IARC Group 2A versus EPA and ECHA no-cancer findings; 2026 Supreme Court preemption ruling and $7.25 billion settlement.
Roupa Nova
Roupa Nova is a Brazilian pop group from Rio de Janeiro, formed in 1980, known for close vocal harmonies and hits like "Sapato velho" and "Whisky a Go Go".
Rouran Khaganate
Rouran Khaganate (柔然汗國), 402–555, a nomadic empire on the Mongolian plateau under khagans such as Shelun and Anagui; rivals of Northern Wei, destroyed by its vassal smith-tribe, the Göktürks.
Rouran–Wei wars and Rouran collapse
The Rouran–Wei wars and Rouran collapse (柔然衰亡) were the wars between the Rouran khaganate and the Northern Wei state; in 520 the khan Anagui fled to Wei and submitted.
Rourkela
Rourkela, or Ispat Nagar, is Odisha's third largest city in Sundargarh district, built around SAIL's Rourkela Steel Plant (est. with West German collaboration, 1 MT phase 1961). Its airport was handed to AAI in 2026 for a 4C upgrade; NIT Rourkela and Raurkela Junction anchor education and rail.
Rous sarcoma virus
Rous sarcoma virus (RSV), Alpharetrovirus avirousar, is a chicken retrovirus discovered by Peyton Rous in 1911 as the first cancer-causing virus; it carries the src oncogene, whose pp60src tyrosine kinase founded oncogene research and three Nobel Prizes.
Rousettus
Rousettus is a genus of Old World fruit bats found across tropical Africa, Asia, and Indian Ocean islands, unusual among fruit bats in echolocating using tongue clicks.
Rousillon Rupes
Rousillon Rupes is a 402-km rupes (scarp) on Titania, Uranus' largest moon, IAU-approved in 1988 and named after a location in Shakespeare's All's Well That Ends Well.
Rousimar Palhares
Rousimar Palhares, "Toquinho", Brazilian MMA leg lock specialist born 1980; UFC 8-4, WSOF welterweight champion; repeatedly suspended for holding submissions after taps; retired 2024.
Rouslan Krechetnikov
Rouslan Krechetnikov is a fluid dynamicist and applied mathematician, a professor at the University of Alberta who won the 2012 Ig Nobel Prize for studying why coffee spills.
Roussivau
Roussivau is a lieu-dit in the Estérel massif, Saint-Raphaël, Var, France, 4.5 km from Agay, known for a Roman villa with olive press, fertile dark-red volcanic tuffs, and its debated toponym.
Roussy-Lévy syndrome
Roussy-Lévy syndrome (hereditary areflexic dystasia), described 1926, is an autosomal dominant CMT phenotype with gait ataxia, pes cavus, areflexia, and postural tremor, usually from the PMP22 17p11.2 duplication (CMT1A), sometimes MPZ mutation (CMT1B).
Route 1 (Iceland)
Route 1, called the Ring Road (Hringvegurinn), is Iceland's longest road, a 1,322 km highway encircling the country and connecting Reykjavík to nearly every region.