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Churchill tank
The Churchill tank, formally Tank, Infantry, Mark IV, was a British infantry tank of the Second World War built by Vauxhall Motors and named after Winston Churchill.
Chutyrsko-Kiyengopskoye Oil and Gas Field
Chutyrsko-Kiyengopskoye is an oil and gas field in central Udmurtia, Russia, 50 to 60 km north of Izhevsk, discovered in 1962, the republic's largest, operated by Udmurtneft and producing since 1970.
Chuzhou power station
Chuzhou power station (中煤滁州电厂), originally the Datang Chuzhou project, is a 1,320 MW coal-fired power station in Chuzhou, Anhui, China, owned mainly by China Coal Xinji Energy and in commercial operation since 2026.
Chwee-Teck Lim
Chwee-Teck Lim is a Singaporean biomedical engineer and professor at the National University of Singapore known for microfluidic cancer diagnostics, flexible wearable sensors, and six startups, elected to the US National Academy of Engineering in 2026.
Chyrpe
Chyrpe is a mobile dating app launched in May 2024 for female-led relationships and femdom dynamics, operated by Greenrocks Development Ltd in London and featuring women's conversation controls.
CI/CD for data
CI/CD for data applies continuous integration and continuous delivery (DataOps, dbt CI, schema migration tooling) to analytics pipelines, databases, and ML systems, adding schema versioning, data quality testing, and snapshot practices beyond ordinary software CI/CD.
CIA triad
The CIA triad, also known as confidentiality, integrity, and availability, is an information security model introduced in the 1972 Anderson Report and defined in US federal standard FIPS 199.
CIAM (architecture)
CIAM (Congrès Internationaux d'Architecture Moderne, International Congresses of Modern Architecture) was an organization of avant-garde architects founded in Switzerland in 1928 and dissolved in 1959; it championed the Functional City and the Athens Charter.
CICERO
CICERO is an artificial intelligence agent for the board game Diplomacy, built by Meta's FAIR group and reported in Science in November 2022 to achieve human-level play.
CIDOC Conceptual Reference Model
The CIDOC Conceptual Reference Model (CRM) is a formal ontology for cultural heritage documentation, developed by CIDOC since 1996 and an ISO standard since 2006.
Ciel et Terre
Ciel et Terre (Ciel & Terre International) is a French company near Lille that designs and installs floating solar systems, with more than 350 projects worldwide.
Ciena
Ciena is an American networking equipment and software company headquartered in Hanover, Maryland. Founded in 1992, it pioneered DWDM and ranks among the top optical transport vendors.
Cierva Autogiro Company
The Cierva Autogiro Company was a British aircraft company founded in 1926 to hold the patents to Juan de la Cierva's autogiro and license its construction.
Cierva C.30
The Cierva C.30 is a two-seat autogyro designed by Juan de la Cierva, first flown in 1933 and the first practical rotorcraft with direct rotor control.
CIFAR-10
CIFAR-10 is a dataset of 60,000 small color images in 10 classes, created by Alex Krizhevsky, Vinod Nair, and Geoffrey Hinton as a standard machine learning benchmark.
Cigar Lake Mine
Cigar Lake Mine is an underground uranium mine in northern Saskatchewan, Canada, and the world's highest-grade, with ore averaging about 18% uranium, operated by Cameco since 2014.
Cigarette filter
A cigarette filter is a cellulose acetate plug at the mouth end of a cigarette, marketed as harm reduction despite no proven health benefit for smokers.
Cigarette holder
A cigarette holder, also called a quellazaire, is an elongated tube with a mouthpiece and socket for a cigarette, fashionable with women from the 1920s into the 1960s and declining by the 1970s.
Cigéo
Cigéo (Centre industriel de stockage géologique) is France's Andra-led project to bury high-level and long-lived radioactive waste about 500 meters underground in claystone at Bure, with commissioning not before 2050.
Cignal TV
Cignal TV, also known as GV Broadcasting Systems or MediaScape, is a Philippine satellite pay television company launched in 2009 under MediaQuest Holdings, offering Cignal Play streaming.
CIGS
CIGS, short for copper indium gallium selenide, is a thin-film solar-cell absorber material whose certified laboratory record efficiency reached 23.64% in 2024, developed at Uppsala University with First Solar.
CIJAA-PT Oficina Oil Pipeline
The CIJAA-PT Oficina oil pipeline, also known as the José-PT Oficina pipeline, is a 20-inch, 150-kilometer Venezuelan crude oil pipeline operated by PDVSA.
CIL (Intermediate Language)
CIL (C Intermediate Language) is an intermediate representation, library, and set of tools created at UC Berkeley in 2002 that compiles C programs into a clean, simplified subset of C.
Cilacap Sumber power station
Cilacap Sumber power station (Indonesian: PLTU Cilacap) is a 2,260 MW coal-fired power station in Cilacap Regency, Central Java, Indonesia, with four units built between 2006 and 2019.
Cimatron
Cimatron is an integrated CAD/CAM software suite for tooling design and manufacture, covering molds, dies, and electrodes from quoting through 2.5- to 5-axis CNC programming.
Cimcorp
Cimcorp is a Finnish automation integrator in Ulvila, founded as part of Rosenlew and known for robotic material handling in tire plants and grocery distribution.
CIMON
CIMON (Crew Interactive MObile companioN) is a spherical AI-based free-flying robot developed by Airbus and IBM to assist astronauts on the International Space Station, first flown in 2018.
CINAHL
CINAHL, short for Cumulative Index to Nursing and Allied Health Literature, is a bibliographic database owned by EBSCO that indexes over 5,500 journals in nursing and allied health back to 1937.
Cincinnati Gardens
Cincinnati Gardens was an indoor arena in the Bond Hill neighborhood of Cincinnati, Ohio, opened in 1949, home to the NBA's Cincinnati Royals and Oscar Robertson, and demolished in 2018.
Cincinnati Incorporated
Cincinnati Incorporated is an American, family-owned machine tool manufacturer founded in Cincinnati in 1898 and headquartered in Harrison, Ohio, building press brakes, shears, fiber lasers, and automation for metal fabrication.