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Clearway Energy
Clearway Energy, Inc. is an American clean energy company based in Princeton, New Jersey, owning about 13.2 GW of wind, solar, storage, and flexible generation across 27 states.
Cleat (shoe)
A cleat, called a football boot in British English, is an athletic shoe with projecting studs that sink into grass or turf, giving traction for running, cutting, and turning.
Cleavage fracture
Cleavage fracture is a brittle fracture mode in which a crystal splits directly across crystallographic planes; in ferritic steels it rises at low temperatures and drives the ductile-to-brittle transition.
Cleco Corporate Holdings
Cleco Corporate Holdings is a regional energy holding company in Pineville, Louisiana, in business since 1935, whose regulated utility Cleco Power serves about 298,000 retail customers in 24 parishes.
Cleddau Bridge
The Cleddau Bridge is a steel box-girder road bridge carrying the A477 across the river Cleddau in Pembrokeshire, Wales, which collapsed during construction in 1970, killing four men.
Clem7
Clem7, formally the Clem Jones Tunnel, is a tolled road tunnel in Brisbane, Australia, opened in 2010 and named after former lord mayor Clem Jones.
Clemens Burda
Clemens Burda is a Swiss-trained physical chemist and materials scientist at Case Western Reserve University in Cleveland, Ohio, known for nitrogen-doped photocatalysts and targeted gold nanoparticles for light-activated cancer therapy.
Clement Delangue
Clément Delangue is a French entrepreneur who co-founded the AI company Hugging Face in New York City in 2016 and has been its chief executive officer since.
Clemson-class destroyer
The Clemson-class destroyer, or Clemson class, was a class of 156 flush-deck destroyers built for the US Navy from 1918 to 1922, the largest American destroyer program until the Fletcher class.
Cleo Labs, Inc.
Cleo Labs, Inc., trading as Cleo or Meet Cleo, is a London-based fintech company founded in 2016 by Barney Hussey-Yeo, offering an AI money coach with cash advances up to $250.
Cleopatra Cabuz
Cleopatra "Cleo" Cabuz is a Romanian-born American engineer who spent her career developing MEMS and micro-sensors at Honeywell, retiring as a vice president, and holds 59 U.S. patents.
Cleopatra's Needle (London)
Cleopatra's Needle is an ancient Egyptian granite obelisk of Thutmose III standing on the Victoria Embankment beside the Thames in London, erected in 1878 and misnamed for Cleopatra.
Clerestory
A clerestory is a band of high windows near a roofline, raised above adjoining lower roofs to admit light and air into a building's interior.
Clerk (authentication company)
Clerk is an American authentication and user-management company founded in 2019 by brothers Colin and Braden Sidoti, offering prebuilt React components for sign-in, sessions, and organizations.
Clermont (steamboat)
The Clermont, officially the North River Steamboat, was an American steamboat that in 1807 made the first commercially successful steam voyage, from New York City to Albany.
Clermont Coal Mine
The Clermont Coal Mine is a large open-cut thermal coal mine near the town of Clermont in Queensland's Bowen Basin, which produced its first export coal in 2010.
Cleveland Electric Illuminating Company
The Cleveland Electric Illuminating Company, known as The Illuminating Company, is an electric utility headquartered in Cleveland, Ohio, serving about 0.8 million customers in northeastern Ohio.
Cleveland Hopkins International Airport
Cleveland Hopkins International Airport (CLE) is Ohio's busiest airport, about 12 miles southwest of downtown Cleveland. Opened in 1925, it was the first municipally owned airport in the United States.
Cleveland-class cruiser
The Cleveland-class cruiser was a class of light cruisers built for the United States Navy during World War II, the most numerous cruiser class ever built.
Cleveland-Cliffs
Cleveland-Cliffs is a Cleveland, Ohio-based steel producer and North America's largest flat-rolled steelmaker. Founded as an iron ore miner in 1847, it became a full steelmaker around 2020.
Clever (company)
Clever, also known as Clever.com, is an American education technology company in San Francisco providing single sign-on and automated rostering for K-12 schools, founded in 2012.
Cleverbot
Cleverbot is a web-based chatbot created by British programmer Rollo Carpenter, online since 2006, that answers by searching its database of past human conversations rather than following pre-programmed rules.
CleverTap
CleverTap is a customer engagement and retention platform company founded in Mumbai in 2013 and headquartered in Mountain View, California, serving 1,200 brands in 100 countries.
CLF-QP controller
A CLF-QP controller is a real-time control method that enforces Lyapunov stability as a constraint in a quadratic program, developed by Aaron D. Ames for bipedal walking.
Click It or Ticket
Click It or Ticket is a national US seat belt enforcement campaign led by NHTSA, which began in North Carolina in 1993 and runs nationally each May.
ClickBench
ClickBench is an open-source benchmark of analytical (OLAP) databases from ClickHouse: 43 SQL queries over the 100-million-row Yandex.Metrica hits dataset, with public results for over 60 DBMS on AWS c6a.4xlarge.
ClickFix
ClickFix is a social engineering technique in which a fake error message or CAPTCHA tricks users into pasting and running a malicious command themselves, first observed in 2024.
ClickHouse
ClickHouse is an open-source, column-oriented database management system for online analytical processing, created at Yandex, released under the Apache 2 license in 2016, and developed since 2021 by ClickHouse, Inc.
Clickjacking
Clickjacking, also called a UI redress attack, is a web attack that deceives users into clicking concealed interface elements, typically a target page hidden in an invisible frame.
Clicks Communicator
The Clicks Communicator is an Android smartphone with a physical QWERTY keyboard, made by Clicks Technology and announced at CES in January 2026 as the company's first standalone phone.