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Clang
Clang is a compiler front end for the C family of languages (C, C++, Objective-C) that is part of the LLVM project, introduced in 2007 and designed to work with GCC build systems.
Clanker
Clanker is a slang pejorative for robots, AI systems, and AI-generated content, borrowed from the Star Wars droids' clanking sound and widely spread online in 2025.
Clap and fling
Clap and fling, also known as the Weis-Fogh mechanism, is an unsteady aerodynamic lift mechanism in insect flight described by Torkel Weis-Fogh in 1973 from the tiny wasp Encarsia formosa.
Clapham Junction rail crash
The Clapham Junction rail crash, also known as the Clapham rail disaster, was a 1988 London collision between three trains that killed 35 people and injured nearly 500.
Clapham Junction railway station
Clapham Junction railway station is a major interchange in Battersea, London. Opened in 1863, it has 17 platforms, around 2,000 trains a day, and Britain's highest passenger interchanges.
Clapper (service)
Clapper is an ad-free short-form video and livestreaming social media app founded in 2020 by Dallas entrepreneur Edison Chen, which grew as a TikTok alternative during US regulatory uncertainty.
CLARAty
CLARAty (Coupled Layer Architecture for Robotic Autonomy) is a reusable robotic software framework developed at NASA's Jet Propulsion Laboratory, beginning in 2001, primarily for planetary rovers.
Clare P. Grey
Clare P. Grey is a British chemist and Cambridge professor who pioneered in-situ NMR spectroscopy of operating batteries, cofounded Nyobolt, and was appointed DBE in 2022.
Clarence House
Clarence House is a Grade I listed royal residence in Westminster, London, built by John Nash in 1825–27 and home to King Charles III since 2003.
Clarence Hugo Linder
Clarence Hugo Linder (1903–1994) was an American electrical engineer who spent 1924 to 1963 at General Electric, ending as a corporate vice president, and served as IEEE president in 1964.
Clarence Syvertson
Clarence A. "Sy" Syvertson (1926–2010) was an American aerospace engineer and hypersonics pioneer who spent his career at NASA Ames, serving as its fourth director from 1978 to 1984.
Clariant
Clariant is a Swiss specialty chemicals company based in Muttenz, formed in 1995 from a spin-off of the Sandoz Chemicals Division, serving industries from oil and gas to personal care.
Clarifai
Clarifai is an American AI company founded in 2013 by Matthew Zeiler, offering a full-stack platform for building, training, and deploying machine learning models, with roots in computer vision.
Clarifier
A clarifier is a large rectangular or circular sedimentation tank in water and wastewater treatment where slowed flow lets suspended solids settle by gravity and floatables rise, removing about 60 percent of solids.
Clarinete Gas Field
Clarinete is an onshore natural gas field in Sucre, Colombia, discovered in 2014, producing dry gas from the Ciénaga de Formation and operated by Canacol Energy.
Clario
Clario names two technology companies: Clario Tech, a consumer cybersecurity brand founded in 2019 from the MacKeeper lineage, and Clario Holdings, a clinical-trial company sold to Thermo Fisher in 2025 for $8.875 billion.
Clarivate
Clarivate is a British-domiciled information, analytics, and software company formed in 2016 from Thomson Reuters' Intellectual Property & Science business, sold to Onex and Baring Private Equity Asia.
Clark (NVE) power station
The Edward W. Clark Generating Station, known as Clark, is a natural gas-fired power plant in Whitney, Nevada, owned by NV Energy and rated at 1,102 megawatts.
Clark Air Base
Clark Air Base, also known as Clark Field, was the largest United States overseas military air base in the Philippines, abandoned after the 1991 Mount Pinatubo eruption.
Clark Blanchard Millikan
Clark Blanchard Millikan (1903–1966) was an American aeronautical engineer at Caltech whose wind tunnels shaped American aircraft design and who helped found the Jet Propulsion Laboratory.
Clark Enterprises
Clark Enterprises is the Bethesda, Maryland holding company of A. James Clark, a University of Maryland-trained civil engineer who built one of the largest privately held US construction companies.
Clark International Airport
Clark International Airport, also called Diosdado Macapagal Airport, is the main international gateway for Central and Northern Luzon in Pampanga, Philippines, built on the former Clark Air Base.
Clark unit hydrograph
The Clark unit hydrograph is a synthetic unit hydrograph method, proposed by C. O. Clark in 1945, that translates rainfall excess along a time-area histogram and routes it through a linear reservoir.
Clark W. Gellings P.E.
Clark W. Gellings is an American electrical engineer elected to the National Academy of Engineering in 2016 for leadership in demand-side management and digital technology for power systems.
Clarkson PLC
Clarkson PLC, trading as Clarksons, is a British provider of integrated shipping services headquartered in London. Founded in 1852, it is the world's largest shipbroker and is listed on the London Stock Exchange.
Class (programming)
A class, also called a class definition, is a programming construct serving as a template for objects, defining their data and methods; it originated in Simula in the 1960s.
Class 8 truck
A Class 8 truck is a commercial vehicle with a gross vehicle weight rating of 33,001 pounds or more, the heaviest category in North American truck classification.
Class activation mapping
Class activation mapping (CAM) is a visualization technique for convolutional neural networks, introduced by Bolei Zhou and colleagues in 2016, that produces heatmaps highlighting image regions driving a prediction.
Class diagram
A class diagram, or UML class diagram, is a static structure diagram in the Unified Modeling Language showing a system's classes, their attributes and operations, and their relationships.
Class E amplifier
A Class E amplifier is a switching-mode radio-frequency power amplifier in which the transistor operates as a switch, ideally approaching 100 percent efficiency; it was named by the Sokals in 1975.