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Château des Ducs de Bretagne
The Château des Ducs de Bretagne is a fifteenth-century castle in Nantes, France, built by Duke Francis II of Brittany, housing the city's history museum since 2007.
Château Frontenac
The Château Frontenac, also known as the Fairmont Le Château Frontenac, is a grand railway hotel in Quebec City, opened in 1893 on a cliff above the St. Lawrence River.
Château Gaillard
Château Gaillard is a ruined medieval fortress at Les Andelys in Normandy, France, built by Richard the Lionheart between 1196 and 1198 to guard the Seine.
Chateau Marmont
Chateau Marmont, also known as Chateau Marmont Hotel, is a castle-like 1929 hotel on Sunset Boulevard in West Hollywood, long a discreet retreat for film-industry figures.
ChatGPT
ChatGPT, or Chat Generative Pre-trained Transformer, is a conversational AI assistant developed by OpenAI, built from GPT language models and reaching 100 million users within two months.
ChatGPT Agent
ChatGPT Agent is a general-purpose AI agent from OpenAI, launched in July 2025, that browses the web, runs code, and builds spreadsheets and presentations on its own virtual computer.
ChatGPT Atlas
ChatGPT Atlas was an AI-integrated web browser developed by OpenAI, built on Chromium and released for macOS on October 21, 2025, with an agent mode.
ChatGPT Deep Research
ChatGPT Deep Research, also called OpenAI Deep Research, is an agentic ChatGPT feature, launched in 2025, that browses hundreds of sources and produces a structured, cited report.
ChatGPT in education
ChatGPT in education covers the adoption and controversies of OpenAI's ChatGPT in K-12 schools and universities since its launch in November 2022, including widespread student use and unreliable AI detectors.
ChatGPT Search
ChatGPT Search is a web-search feature built into OpenAI's ChatGPT assistant, launched on October 31, 2024, that answers questions using current web results with inline citations.
Chatham Dockyard
Chatham Dockyard, also known as Chatham Royal Dockyard, was a Royal Navy dockyard in Kent, established in 1567, that built HMS Victory and over 400 ships.
Chatroulette
Chatroulette, also known as Chatroulette.com, is a random video chat website pairing strangers for webcam conversations, launched in November 2009 by the Russian teenager Andrey Ternovskiy.
Chatsworth House
Chatsworth House is a Grade I listed country house in the Peak District, Derbyshire, home of the Dukes of Devonshire since 1549, with a 105-acre garden and notable art collection.
Chatter suppression in robotic machining
Chatter suppression in robotic machining is the set of modeling, planning, and hardware methods that prevent self-excited vibration when industrial robots perform cutting operations such as milling.
Chatterbox
Chatterbox is a family of open-source text-to-speech models released by Resemble AI beginning in April 2025, known for emotion exaggeration control and a neural watermark in every generated file.
Chatti Bariatu Coal Mine
The Chatti Bariatu Coal Mine is a 7 MTPA opencast coal mine in the North Karanpura coalfield, Hazaribagh district, Jharkhand, India, owned by NTPC Mining Limited.
ChatTTS
ChatTTS is an open-source conversational text-to-speech model family released in May 2024 by the developer group 2noise, built for natural spoken dialogue in Chinese and English.
Chauchat
The Chauchat, or Fusil Mitrailleur Modèle 1915 CSRG, was the most widely manufactured automatic weapon of World War I, with 244,000 French light machine guns built from 1915 to 1918.
Chaudhary Charan Singh International Airport
Chaudhary Charan Singh International Airport, also known as Amausi Airport, is an international airport serving Lucknow, India, located at Amausi about 11 km from the railway station.
Chauffeur
A chauffeur is a person employed to drive a private motor vehicle for others, typically in a limousine, van, or private car, hired for single trips or on a regular basis.
Chausath Yogini Temple, Hirapur
The Chausath Yogini Temple at Hirapur is a 9th-century circular, roofless Hindu temple near Bhubaneswar, Odisha, dedicated to sixty-four yogini deities of a Shakta-Tantric cult.
Chawl (चाळ)
Chawl (चाळ): Mumbai housing type of single-room tenements along common corridors with shared toilets, built from the mid-1800s for textile mill workers; BIT and BDD chawls, and their ongoing redevelopment.
Chayandinskoye Oil and Gas Asset
Chayandinskoye field (Чаяндинское) is a Gazprom-operated oil, gas, and condensate field in Yakutia, Russia, the main resource base for the Power of Siberia pipeline to China.
Chayvo-De-Kastri Oil Pipeline
The Chayvo-De-Kastri Oil Pipeline is a 225-kilometer, 24-inch crude oil export pipeline of the Sakhalin-1 project, carrying oil from Sakhalin Island to the De-Kastri terminal, commissioned in 2006.
CHC Helicopter
CHC Helicopter, also known as Okanagan Helicopters, is a Texas-based company providing helicopter services, including offshore crew transport for the energy industry, search and rescue, and maintenance through Heli-One.
Cheboksary Hydroelectric Station
The Cheboksary Hydroelectric Station (Чебоксарская ГЭС) is a 1,370 MW hydroelectric dam at Novocheboksarysk on the Volga River in Chuvashia, Russia, the last step of the Volga cascade.
Chebyshev filter
A Chebyshev filter is an electronic or digital filter designed around Chebyshev polynomials, trading equal ripple in one band for a steeper roll-off than a same-order Butterworth filter.
Chebyshev linkage
The Chebyshev linkage is a four-bar linkage devised by Russian mathematician Pafnuty Chebyshev that converts rotation into approximate straight-line motion; it drove his plantigrade machine, the first walking machine, shown in Paris in 1878.
Check dam
A check dam, also known as a check weir, is a small dam across a channel, gully, or drainage ditch that slows runoff, reduces erosion, and traps sediment.
Check engine light
The check engine light, officially the malfunction indicator lamp and often labeled "Service Engine Soon," warns when a car's on-board diagnostic system detects an emission-related malfunction.