C-3PO () or See-Threepio is a humanoid robot character from the Star Wars franchise who appears in the original trilogy, the prequel trilogy and the sequel trilogy. Rebuilt by Anakin Skywalker, C-3PO was designed as a protocol droid intended to assist in etiquette, customs, and translation, boasting that he is "fluent in over six million forms of communication". Along with his astromech droid counterpart and friend R2-D2, C-3PO provides comic relief within the narrative structure of the films, and serves as a foil. Anthony Daniels has portrayed the character in all ten Star Wars cinematic films released to date, including Rogue One and the animated The Clone Wars; C-3PO and R2-D2 are the only characters to appear in every film. Despite his oblivious nature, C-3PO has played a pivotal role in the Galaxy's history, appearing under the service of Shmi Skywalker, the Lars homestead, Padmé Amidala, Raymus Antilles, Luke Skywalker, and Leia Organa. In the majority of depictions, C-3PO's physical appearance is primarily a polished gold plating, although his appearance varies throughout the films; including the absence of metal coverings in The Phantom Menace, a dull copper plating in Attack of the Clones, a silver lower right leg introduced in A New Hope, and a red left arm in The Force Awakens. C-3PO also appears frequently in both canon and Star Wars Legends continuities of novels, comic books, and video games, and was the protagonist in the ABC television show Droids.

This article refers to the clamp used to hold together two workpieces. For clamps used to secure stage lighting instruments to battens, see C-Clamp (stagecraft). For the Chicago Indie Rock band, see C-Clamp (band) A C-clamp or G-clamp is a type of clamp device typically used to hold a wood or metal workpiece, and often used in, but are not limited to, carpentry and welding. These clamps are called "C" clamps because of their C-shaped frame, but are otherwise often called G-clamps or G-cramps because including the screw part they are shaped like an uppercase letter G.

C.C.P. Contact Probes Co., Ltd. (Chinese: 中國探針股份有限公司; pinyin: Zhōng Guó Tàn Zhēn Yǒu Xiàn Gōng Sī ) is a Taiwanese manufacturer of testing probes and probe-like connectors. The company was founded by Chung-Kai Huang (黃介崇) on January 22, 1986 and is headquartered in New Taipei, Taiwan. C.C.P Contact Probes., Ltd. operates internationally with global sales offices in China, Hong Kong, USA and Germany and has approximately 1000 employees. The 4 main products are testing solutions, Pogo Pin Connectors, EV Crown Spring Connectors and Industrial Connectors. The company is a supplier for Pogo Pin connectors of major brands around the world such as Apple, Huawei, and Microsoft. Known products such as the Macbook Series from Apple Inc. or the Surface Pro 4 from Microsoft are using magnet connectors from C.C.P. Contact Probes.C.C.P. Contact Probes Co., Ltd. is listed at the Taiwanese Stock Exchange (Bloomberg Ticker: 6217:TT). In 2017, it had approximately NTD1,892.3 million (~USD60 million) revenue and a Net Income of NTD159.3 million (~USD5.15 million).

C3D Toolkit is a geometric modeling kit originally developed by ASCON Group, now by C3D Labs, using C++ and written in Visual Studio. C3D Toolkit responsible for constructing and editing geometric models. It can be licensed by other companies for use in their 3D computer graphics software products. The most widely known software in which geometric kernels, like C3D, are typically used are computer aided design (CAD), computer-aided manufacturing (CAM), and computer-aided engineering (CAE) systems. As the software development tool, C3D incorporates four CAD modules: 3D modeling, 3D constraint solving, 3D visualization, and 3D file conversions: C3D Modeler constructs geometric models, generates flat projections of models, performs triangulations, calculates the inertial characteristics of models, and determines whether collisions occur between the elements of models; C3D Modeler for Teigha enables advanced 3D modeling operations through the Teigha's standard "OdDb3DSolid" API from the Open Design Alliance; C3D Solver makes connections between the elements of geometric models, and considers the geometric constraints of models being edited; C3D Vision controls the quality of rendering for 3D models using mathematical apparatus and software, and the workstation hardware; C3D Converter reads and writes geometric models in a variety of standard exchange formats.

Cab-over, also known as cab over engine (COE), cab forward (U.S.), or forward control (UK), is a body style of truck, bus, or van that has a vertical front, "flat face" or a semi-hood, with the cab of the truck sitting above (or forward of) the front axle. This contrasts with a conventional truck where the engine is mounted in front of the driver. This truck configuration is currently common among European and Asian truck manufacturers. European regulations set restrictions for both the total length and the length of the load area, which allow a cab length of 2.35m in combination with the maximum load area length. This allows a sleeper cab with a narrow bunk, and would allow a bonneted (hooded) day cab. Nonetheless, no manufacturer in Europe produces such day cabs with bonnets. The last manufacturer of a conventional in Europe, Scania, stopped production in 2005. (The reason was a decline to less than 1000 units worldwide, with European sales declining by 50% and sales in South America by 90%, within one decade.) Generally speaking, Asian regulations are even stricter, and the relatively shorter journey distances allow more heavy trucks to forego sleepers to save even more length. Cabover trucks are widely used in the United States for refuse collection, terminal tractors, and other vocational applications requiring a tight turning radius or frequent ingress/egress by the driver. Autocar, the oldest surviving motor vehicle manufacturer in America, produces only cabover trucks. Although cabover trucks were popular among United States heavy truckers and trucking companies during the 1970s because of strict length laws in many states, when those length laws were repealed, most heavy-truck makers moved to other body styles. One of the reasons is the Federal Bridge Formula, which is unique to the USA, and encourages spreading out the load. If axle distances are too tight, the maximum load allowance is reduced. For COEs operated at maximum weight in the USA, this required an axle directly behind the front bumper. This cab design caused an awkward climb into the cab for the driver, forcing them to climb up behind the front wheel, then moving to the front and into the cab. European or Chinese or Japanese truckers enter their cab in a straight fashion with handrails left and right. Cabovers are also very popular in the USA's light- and medium-duty truck segment where compact size is required for urban mobility without sacrificing payload; Toyota subsidiary Hino, Isuzu, and Mitsubishi Fuso models are a regular sight for this reason. American companies Paccar (which owns the Kenworth and Peterbilt brands) and Freightliner still manufacture traditional cab over engine designs for the Australian and South African markets where length restrictions still make them advantageous. In Australia both American (cab over axle) and European/Japanese/Chinese (cab forward of axle) types, as well as the conventional type are common. Cab over engine types dominate urban and light duty use, with conventional trucks predominating in remote and off-road areas. Both types are common for highway use.

A cabinet is a box-shaped piece of furniture with doors and/or drawers for storing miscellaneous items. Some cabinets stand alone while others are built in to a wall or are attached to it like a medicine cabinet. Cabinets are typically made of wood (solid or with veneers or artificial surfaces), coated steel (common for medicine cabinets), or synthetic materials. Commercial grade cabinets, which differ in the materials used, are called casework. Cabinets usually have one or more doors on the front, which are mounted with door hardware, and occasionally a lock. Cabinets may have one or more doors, drawers, and/or shelves. Short cabinets often have a finished surface on top that can be used for display, or as a working surface, such as the countertops found in kitchens. A cabinet intended to be used in a bedroom and with several drawers typically placed one above another in one or more columns intended for clothing and small articles is called a chest of drawers. A small bedside cabinet is more frequently called a nightstand or night table. A tall cabinet intended for clothing storage including hanging of clothes is called a wardrobe or an armoire, or (in some countries) a closet if built-in.

Cable carriers, also known as drag chains, energy chains, or cable chains depending on the manufacturer, are guides designed to surround and guide flexible electrical cables and hydraulic or pneumatic hoses connected to moving automated machinery. They reduce wear and stress on cables and hoses, prevent entanglement, and improve operator safety. Cable carriers may be arranged to accommodate horizontal, vertical, rotary and three-dimensional movements.

A cable gland (in the U.S. more often known as a cable connector or fitting) is a device designed to attach and secure the end of an electrical cable to the equipment. A cable gland provides strain-relief and connects by a means suitable for the type and description of cable for which it is designed—including provision for making electrical connection to the armour or braid and lead or aluminium sheath of the cable, if any. Cable glands may also be used for sealing cables passing through bulkheads or gland plates. Cable glands are mechanical cable entry devices. They are used throughout a number of industries in conjunction with cable and wiring used in electrical instrumentation and automation systems. Cable glands may be used on all types of electrical power, control, instrumentation, data and telecommunications cables. They are used as a sealing and termination device to ensure that the characteristics of the enclosure which the cable enters can be maintained adequately. Cable glands are made of various plastics, steel, brass or aluminum. Glands intended to resist dripping water or water pressure will include synthetic rubber or other types of elastomer seals. Certain types of cable glands may also serve to prevent entry of flammable gas into equipment enclosures, for electrical equipment in hazardous areas. Although cable glands are often called "connectors", a technical distinction can be made in the terminology, which differentiates them from quick-disconnect, conducting electrical connectors. For routing pre-terminated cables (cables with connectors), split cable glands can be used. These cable glands consist of three parts (two gland halves and a split sealing grommet) which are screwed with a hexagonal locknut (like normal cable glands). Thus, pre-assembled cables can be routed without removing the plugs. Alternatively, split cable entry systems can be used (normally consisting of a hard frame and several sealing grommets) to route a large number of pre-terminated cables through one wall cut-out. There are at least three types of thread standard used: Panzergewinde (PG standard) Metric thread National Pipe Thread (inch system)

A cable reel is a round, drum-shaped object such as a spool used to carry various types of electrical wires. Cable reel which can also be termed as drums have been used for many years to transport electric cables, fiber optic cables and wire products. Cable reels usually come in four different types, each with their own uses: wood, plywood, plastic and steel.

A cable tie (also known as a wire tie, hose tie, steggel tie, zap strap or zip tie, and by the brand names Ty-Rap and Panduit strap) is a type of fastener, for holding items together, primarily electrical cables or wires. Because of their low cost and ease of use, cable ties are ubiquitous, finding use in a wide range of other applications. Stainless steel versions, either naked or coated with a rugged plastic, cater for exterior applications and hazardous environments. The common cable tie, normally made of nylon, has a flexible tape section with teeth that engage with a pawl in the head to form a ratchet so that as the free end of the tape section is pulled the cable tie tightens and does not come undone. Some ties include a tab that can be depressed to release the ratchet so that the tie can be loosened or removed, and possibly reused.