All articles starting with M
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Metric tensor (general relativity)
In general relativity, the metric tensor, or spacetime metric, is the symmetric tensor field that defines distances, times, and causal structure, determined by the Einstein field equation.
Metric time
Metric time (decimal time) is a system dividing the day into ten hours, one hundred minutes, and one hundred seconds. It was enacted by revolutionary France in 1793.
Metrication
Metrication is the process by which a country adopts the International System of Units (SI) as its legal system of weights and measures, replacing customary units like the inch and pound.
Metrication in the United Kingdom
Metrication in the United Kingdom is the process of replacing imperial units with the metric system, made official policy in 1965 and still incomplete today.
Metrication in the United States
Metrication in the United States is the shift from U.S. customary units to the metric system, legalized in 1866 but still voluntary, leaving a hybrid system.
MetricStream
MetricStream Inc is a private governance, risk, and compliance software company founded in 1999 and headquartered in Palo Alto, California, selling a cloud platform for enterprise risk and audit.
Metrik
Metrik is the stage name of Tom Mundell, an English drum and bass producer, vocalist, and DJ based in London who has recorded for Hospital Records since 2012.
Metriks AI
Metriks AI, formally Metriks AI S.p.A. Società Benefit, is an Italian AI and data software company founded in 2021 in Milan, serving Italian SMEs with AI-powered B2B data solutions.
Metrizable space
A metrizable space (metrisability, metrizability) is a topological space whose topology is generated by some metric, so that it is homeomorphic to a metric space.
Metrizamide
Metrizamide (brand name Amipaque) is a non-ionic, water-soluble iodinated x-ray contrast medium, the first low-osmolar agent in clinical use, marketed in 1972 by Nyegaard of Oslo and now discontinued.
Metrizoic acid
Metrizoic acid (metrizoate; Isopaque, Triosil) is an ionic monomeric triiodobenzoate X-ray contrast medium, high-osmolar at 2,100 mOsm/kg, historically used in urography and angiography; FDA approval discontinued.
Metro (British newspaper)
Metro is a British free tabloid commuter newspaper launched in London on 16 March 1999, published by DMG Media (DMGT). It became the UK's highest-circulation weekday paper, claims political neutrality, and is rated Left-Center/Mixed by Media Bias/Fact Check.
Metro (franchise)
Metro is a post-apocalyptic franchise from Dmitry Glukhovsky's Metro 2033 novels (Метро 2033) and the 4A Games shooters Metro 2033, Last Light, Exodus, and the announced Metro 2039.
Metro 2033 (novel)
Metro 2033 (Метро 2033) is Dmitry Glukhovsky's 2005 post-apocalyptic novel, first posted free online in 2002, about Artyom's journey across the Moscow Metro after nuclear war; it spawned the Metro 2034/2035 sequels, the Universe of Metro 2033 tie-in series, and the 4A Games video games.
Metro 2033 (Метро 2033) (video game)
Metro 2033 (Метро 2033) is a 2010 first-person shooter by 4A Games, published by THQ, adapting Dmitry Glukhovsky's novel; Artyom crosses post-apocalyptic Moscow's metro, using bullets as currency, with a 2014 Redux remaster.
Metro 2035 (Метро 2035)
Metro 2035 (Метро 2035) is a 2015 post-apocalyptic novel by Dmitry Glukhovsky, third and final book of the Metro trilogy, concluding Artyom's story. Published by AST June 2015, 384 pages; a political spy-thriller dystopia, unlike the horror-tinged Metro 2033, with Polish and Italian translations.
Metro 2039
Metro 2039 is 4A Games' fourth mainline Metro shooter, revealed April 16, 2026, launching February 4, 2027 on PS5, Xbox Series X|S, and PC. New protagonist The Stranger faces the Novoreich regime of Hunter in post-apocalyptic Moscow.
Metro AG
Metro AG, German food wholesaler (METRO/MAKRO cash-and-carry) founded 1964 in Mülheim an der Ruhr, serving HoReCa and Traders in over 30 countries; €32.4 billion sales in FY2024/25, delisted 2026 after Kretinsky takeover.
Metro Atlantic Athletic Conference
Metro Atlantic Athletic Conference (MAAC), NCAA Division I conference founded October 1980 by Army, Fairfield, Fordham, Iona, Manhattan, and Saint Peter's; 13 members; renamed Metro Conference July 1, 2026.
Metro Awakening
Metro Awakening is a 2024 VR survival horror first-person adventure by Vertigo Games and Deep Silver, a prequel to Metro 2033 following doctor Serdar, who becomes Khan, released on PS VR2, Meta Quest, and Steam VR.
Metro Bank (United Kingdom)
Metro Bank is a British retail and commercial bank founded in July 2010 by Vernon Hill, the first new high street bank in Britain in more than a century.
Metro Bilbao
Metro Bilbao is the rapid transit system serving Bilbao and Bizkaia in the Basque Country, Spain, opened in 1995 and known for Norman Foster's stations and glass Fosterito entrances.
Metro Boomin
Metro Boomin (Leland Tyler Wayne) is a St. Louis-born trap producer and DJ behind Not All Heroes Wear Capes, Heroes & Villains, Savage Mode II, and the 2024 Future albums, with a reported ~$70M publishing sale.
Metro Boomin production discography
Metro Boomin (Leland Tyler Wayne, born 1993, St. Louis) is an Atlanta-based trap producer whose discography spans 19 & Boomin (2013), Savage Mode, Not All Heroes Wear Capes, Heroes & Villains, the Spider-Verse soundtrack, and the 2024 Future albums We Don't Trust You and We Still Don't Trust You.
Metro by T-Mobile
Metro by T-Mobile, formerly MetroPCS and founded in 1994, is the flagship prepaid wireless brand of T-Mobile US, the largest US prepaid provider with 21.6 million customers as of 2023.
Metro DC Democratic Socialists of America
Metro DC Democratic Socialists of America (MDC DSA) is the DSA chapter for DC, Montgomery and Prince George's counties, and Northern Virginia, with over 4,000 members, an annual Local Convention, and campaigns such as Stomp Out Slumlords.
Metro de Madrid
Metro de Madrid is the rapid transit system serving Madrid, Spain, and its metropolitan area, opened in 1919 and now run by the Comunidad de Madrid.
Metro de Santiago
Metro de Santiago is the rapid transit system of Santiago, Chile, operated by a state-owned company, with 7 lines, 143 stations, and 149 km of track.
Metro Detroit
Metro Detroit is the metropolitan region around Detroit, Michigan, officially the Detroit-Warren-Dearborn MSA of about 4.4 million across six counties. Defined by the auto industry, suburbanization, Detroit's 2013 bankruptcy, and recent city population growth.
Metro Ethernet
Metro Ethernet, also known as Metropolitan Ethernet, is the use of Ethernet technology to deliver carrier-grade connectivity across metropolitan and wide area networks, replacing Frame Relay and ATM.