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CLIP score
The CLIP score is a reference-free metric measuring how well an image and text description match, introduced by Hessel et al. at EMNLP 2021 for image captioning evaluation.
Clip Studio Paint
Clip Studio Paint is a digital art application developed and sold by the Japanese company Celsys for illustrations, manga, webtoons, and 2D animation, with more than 67 million cumulative shipments.
Clipboard (computing)
The clipboard is a transient data-storage facility provided by an operating system or window system, letting applications transfer text, images, and other data through cut, copy, and paste.
Clippard Instrument Laboratory
Clippard Instrument Laboratory is a family-owned Cincinnati, Ohio manufacturer of miniature pneumatic components founded in 1941, which began as a maker of radio frequency coils and became the world's first miniature pneumatic manufacturer.
Clipper
A clipper is a fast mid-19th-century sailing ship with a sharp raked bow and large canvas spread, built for speed; it carried tea and gold seekers until steamships took over after 1869.
Clipper chip
The Clipper chip was an NSA-designed, tamper-resistant encryption chip announced by the Clinton administration in 1993 to secure communications while allowing law enforcement decryption through key escrow.
Clitoral pump
A clitoral pump, also called a pussy pump, is a suction device that draws blood into the clitoris, prescribed for female sexual arousal disorder and sold as a wellness product.
Clive Oil and Gas Field
Clive is an oil and gas field in central Alberta, Canada, discovered in 1952 in the Leduc Formation and now used for carbon capture and storage.
Clive Sinclair
Clive Sinclair (1940–2021), a British entrepreneur knighted in 1982, founded Sinclair Radionics and Sinclair Research, makers of the ZX Spectrum home computer and the failed C5 electric vehicle.
Cliveden
Cliveden, also known as Cliveden House, is a Grade I listed country house at Taplow, Buckinghamshire, now a National Trust luxury hotel above the Thames.
CLO Virtual Fashion
CLO Virtual Fashion is a South Korean software company, founded in 2009, that develops 3D garment design and simulation tools, including the CLO fashion design software and Marvelous Designer, used in film and games.
Cloaca Maxima
The Cloaca Maxima is ancient Rome's great gravity sewer, begun in the 6th century BC to drain the Forum into the Tiber, and still partly in use.
Cloaking device
A cloaking device is a structure or arrangement of materials that makes an object hard to detect by guiding waves, heat, or fields around it, first demonstrated in 2006.
Clock
A clock is a device that displays time, usually by counting the oscillations of a steady repeating process such as a pendulum, quartz crystal, or atom.
Clock domain crossing
A clock domain crossing (CDC) is the traversal of a signal between two asynchronous clock domains in a digital circuit, where it can cause metastability unless synchronizers are used.
Clock gating
Clock gating is a low-power design technique that disables the clock signal to inactive registers or blocks, stopping their switching and reducing dynamic power consumption.
Clock page replacement algorithm
The clock page replacement algorithm, also called second chance, is a virtual memory policy that approximates LRU using a circular list of pages and a reference bit.
Clock rate
Clock rate, also called clock speed or clock frequency, is the rate at which a processor's internal clock generates pulses that synchronize and pace the CPU's work.
Clock signal
A clock signal, or clock pulse, is a periodic waveform, usually a square wave, that synchronizes digital circuits by marking when registers sample their inputs.
Clock tree synthesis
Clock tree synthesis is the stage of VLSI physical design, after placement and before routing, that builds a balanced buffer tree to distribute the clock with minimal skew.
Clock-face scheduling
Clock-face scheduling, also called a cyclic timetable or Taktfahrplan, plans public transport so trains depart at the same minute each hour, making departure times easy to remember.
Clohessy–Wiltshire equations
The Clohessy–Wiltshire equations, also known as Hill's equations, are linearized equations describing spacecraft relative motion in a circular orbit, published in 1960 and used for rendezvous and docking.
Cloister
A cloister is an open courtyard surrounded by a covered, usually arcaded walkway, forming the organizational heart of a monastery by linking the church with buildings where the community ate, slept, and met.
Clojure
Clojure is a dynamic, functional dialect of Lisp that runs on the Java Virtual Machine. Created by Rich Hickey, it emphasizes immutable data structures and built-in concurrency support.
Clonal selection algorithm
The clonal selection algorithm is an optimization method inspired by the immune system, cloning and mutating the best candidate solutions; the best-known version is CLONALG.
Clonmacnoise
Clonmacnoise (Irish: Cluain Mhic Nóis) is a ruined early medieval monastery on the River Shannon in County Offaly, Ireland, founded about 548 by St Ciarán.
Clorox
The Clorox Company, founded as the Electro-Alkaline Company in Oakland in 1913, is an American multinational manufacturer best known for its liquid bleach, with $7.1 billion in 2025 net sales.
Clos network
A Clos network is a multistage switching network introduced by Charles Clos in 1953 that connects any idle input to any idle output using far fewer crosspoints than a single crossbar.
Close air support
Close air support (CAS) is air action by fixed-wing or rotary aircraft against hostile targets near friendly ground forces, requiring detailed integration with their fire and movement.
Close Quarters Battle Receiver
The Close Quarters Battle Receiver (CQBR), or Mk 18, is a U.S. Navy upper receiver converting the M4A1 into a short 10.3-inch close-quarters weapon, in service since 2000.