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Cincinnati Milacron
Cincinnati Milacron is a Cincinnati machine tool company whose research organization, led by M. Eugene Merchant, turned metal cutting into a science and produced several National Academy of Engineering members.
Cincinnati Subway
The Cincinnati Subway is an unfinished rapid transit tunnel in Cincinnati, Ohio, built in the 1920s in the old Miami and Erie Canal bed; no train has ever run through it.
Cincinnati Union Terminal
Cincinnati Union Terminal is a historic Art Deco railroad station in Cincinnati, Ohio, opened in 1933 to consolidate seven railroads' depots and now home to the Cincinnati Museum Center.
Cincinnati/Northern Kentucky International Airport
Cincinnati/Northern Kentucky International Airport, or CVG, is a public airport in Hebron, Kentucky, serving Cincinnati and hosting the primary U.S. hubs of Amazon Air and DHL.
Cinderella Castle
Cinderella Castle is a 189-foot fairytale castle at the entrance to Fantasyland in Florida's Magic Kingdom, completed in 1971 and inspired by Disney's 1950 animated film Cinderella.
Cindy L. Wallis-Lage
Cindy L. Wallis-Lage is an American civil and environmental engineer who led Black & Veatch's global water business and was elected to the National Academy of Engineering in 2021.
CINECA
CINECA is a non-profit Italian inter-university consortium founded in the late 1960s that operates Italy's largest supercomputing center in Bologna, home to the Leonardo supercomputer and the IT4LIA AI Factory.
Cinema 4D
Cinema 4D (C4D) is Maxon's professional 3D software for modeling, animation, simulation, and rendering, known for MoGraph motion graphics, Redshift bundling, After Effects and Unreal integration, and Windows/macOS subscription licensing.
Cinnamon (desktop environment)
Cinnamon, also known as Cinnamon Desktop, is a free and open-source Linux desktop environment with a traditional layout, developed by the Linux Mint team and first released in 2012.
Cintra
Cintra is a Spanish toll road developer and concessionaire owned by Ferrovial and headquartered in Austin, Texas, operating highways on four continents, including Toronto's 407 ETR.
Cipher
A cipher, or encipherment, is a cryptographic system that transforms plaintext into ciphertext using an algorithm and a key, so only key holders can read the data.
Cipher suite
A cipher suite is a named combination of cryptographic algorithms that a client and server agree on before securing a connection, identified by a two-byte IANA-registered value.
Ciphertext
Ciphertext is data in its encrypted form, the unreadable output of encrypting a readable input called plaintext; only a holder of the correct key can decrypt it back.
Ciphertext-policy attribute-based encryption
Ciphertext-policy attribute-based encryption (CP-ABE) is a public-key encryption scheme in which the encryptor embeds an attribute-based access policy, and only keys with satisfying attributes decrypt.
CipherTrace, Inc.
CipherTrace, Inc. is an American blockchain analytics company founded in 2015 by Dave Jevans and Stephen Ryan, providing cryptocurrency anti-money laundering and forensics services and acquired by Mastercard in 2021.
Cirba Solutions
Cirba Solutions is an American battery recycling and materials company in Charlotte, North Carolina, formed in 2022 that recovers lithium, nickel, and cobalt from spent batteries.
Circadian lighting
Circadian lighting, also called integrative lighting, is the design of indoor light to support circadian rhythms, sleep, and alertness, delivering bright, melanopic-rich light by day and dim light at night.
Circle Internet Group
Circle Internet Group, also known as Circle Internet Financial, is a New York financial technology company that issues the USDC and EURC stablecoins through regulated affiliates.
Circle line (London Underground)
The Circle line is a London Underground service running from Hammersmith once around a loop of Central London to Edgware Road, replacing the former closed circuit in 2009.
Circle MRT line
The Circle MRT line, or Circle Line, is a fully underground, driverless metro line in Singapore linking the other MRT lines, with 33 stations over 39 km.
CircleCI
CircleCI is a continuous integration and continuous delivery platform, founded in San Francisco in 2011, that automatically builds, tests, and deploys software pushed to version control.
Circuit
A circuit is a closed, conductive path through which electric charge continuously flows, typically containing an energy source such as a battery and components like resistors and capacitors.
Circuit breaker
A circuit breaker, or power circuit breaker, is an electrical switching device that opens a circuit automatically on overcurrent and can be reset after tripping.
Circuit complexity
Circuit complexity is the branch of complexity theory that studies the minimum size and depth of Boolean circuits computing Boolean functions, and its ties to Turing-machine computation.
Circuit diagram
A circuit diagram, also known as a circuit map, is a drawing that shows electrical connections only, not physical layout, and is used by engineers to design and troubleshoot circuits.
Circuit électrique (charging network)
The Electric Circuit (French: le Circuit électrique) is a public electric vehicle charging network in Québec, owned by Hydro-Québec since its launch in 2012 as Canada's first such network.
Circuit extraction
Circuit extraction is an electronic design automation method that derives a circuit's devices, connectivity, and parasitic resistances and capacitances from an integrated circuit's mask layout.
Circuit simulation
Circuit simulation is the numerical solution of the differential equations describing an electronic circuit, predicting voltages and currents before hardware is built; SPICE-class simulators combine DC, small-signal, and transient analysis and became the worldwide standard.
Circuit switching
Circuit switching is a network method that reserves a dedicated communication path between two endpoints for the full duration of a call, as in the telephone network.
Circuit tracing and attribution graphs
Circuit tracing is an interpretability technique introduced by Anthropic in March 2025 that maps a language model's internal computation onto human-readable graphs called attribution graphs.