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Cross-origin resource sharing
Cross-origin resource sharing (CORS) is an HTTP-header-based mechanism letting a server state which origins a browser may allow to load its resources, relaxing the same-origin policy under the server's control.
Cross-phase modulation
Cross-phase modulation (XPM) is a nonlinear optical effect where one light wave's phase is shifted by another wave's intensity, a key impairment in wavelength-division multiplexed fiber systems.
Cross-platform interchange
A cross-platform interchange is a rail station layout where trains on different lines stop on the same platform, letting passengers transfer by simply walking across.
Cross-site request forgery
Cross-site request forgery (CSRF), also known as session riding, is a web vulnerability where an attacker induces a logged-in user's browser to perform unintended actions, such as changing a password.
Cross-site scripting
Cross-site scripting (XSS) is a class of injection attack in which malicious scripts are injected into trusted websites and run in victims' browsers, able to steal cookies and rewrite pages.
Cross-State Air Pollution Rule
The Cross-State Air Pollution Rule (CSAPR) is a 2011 EPA regulation limiting sulfur dioxide and nitrogen oxide emissions from fossil fuel-fired power plants in 28 eastern states.
Crossair
Crossair was a Swiss regional airline headquartered at Basel, founded in 1978 by former Swissair pilot Moritz Suter and becoming the new national carrier SWISS in 2002.
Crossair Flight 3597
Crossair Flight 3597 was a scheduled flight from Berlin Tegel to Zurich that crashed while approaching the airport on 24 November 2001, killing 24 of the 33 people on board.
Crossarm
A crossarm is a structural beam bolted near the top of a utility pole that supports conductors, insulators, and transformers on overhead distribution and transmission lines.
Crossbar switch
A crossbar switch, also called a crosspoint switch, is an electromechanical telephone switching device using a matrix of crosspoints to connect any incoming line to any outgoing line.
Crossbow
The crossbow, also known as a bowgun or balister, is a projectile weapon with a bow mounted on a stock, fired by a trigger holding the string drawn.
Crossbow bolt
A crossbow bolt, also called a quarrel, is the short, heavy projectile fired from a crossbow: a stout wooden shaft with a metal head and rear vanes.
CrossCountry
CrossCountry, also known as Arriva CrossCountry, is a British train operating company running long-distance intercity services from Aberdeen to Penzance and Stansted to Cardiff, without serving London.
Crossed helical gear
A crossed helical gear, also called a screw or spiral gear, is a helical gear that transmits motion between skew, nonintersecting shafts, most often at 90°.
Crossing tower
A crossing tower is a transmission tower built at a wide obstacle such as a river, strait, or valley, where the line must span far farther than normal.
Crossley Motors
Crossley Motors Limited was a British vehicle manufacturer in Manchester, England, that built cars from 1904 to 1937 and buses, commercial, and military vehicles until 1956, ending under AEC.
Crosslink
A crosslink is a direct communication link between two or more satellites that bypasses ground stations, first demonstrated by MIT Lincoln Laboratory's LES 8 and 9 in 1978.
Crossover (genetic algorithm)
Crossover, also called recombination, is the genetic algorithm operator that exchanges genetic material between two or more parent solutions to produce offspring for the next generation.
Crossover SUV
A crossover SUV, or CUV, is a sport utility vehicle built on a car-like unibody platform rather than a truck-based ladder frame, combining SUV space with car-like fuel economy.
Crossrail
Crossrail is a railway program in London that built a new east–west line from Reading and Heathrow to Shenfield and Abbey Wood, opened in 2022 as the Elizabeth line.
Crossrail 2
Crossrail 2, also known as the Chelsea–Hackney Line, is a proposed railway linking Surrey to Hertfordshire through central London, promoted by Transport for London and Network Rail.
Crosstalk
Crosstalk, also known as signal crosstalk, is the unintended coupling of a signal between adjacent electrical or optical channels, a central signal integrity concern in high-speed circuits.
Crosstex Energy, L.P.
Crosstex Energy, L.P., renamed EnLink Midstream Partners, LP in 2014, was a publicly traded midstream partnership that gathered, processed, and marketed natural gas and NGLs.
Crosstown Fiber Holdings LLC
Crosstown Fiber Holdings LLC is a telecommunications company based in Lombard, Illinois. It builds over 450 route miles of underground fiber for enterprise and institutional customers.
Crosswind landing
A crosswind landing is a landing made when wind blows across the runway, requiring pilots to correct lateral drift using the crab or wing-low method.
Croton Aqueduct
The Croton Aqueduct was New York City's first major water-supply works, a 41-mile gravity-fed masonry conduit carrying water from the Croton River in Westchester to Manhattan reservoirs from 1842.
Crotto
A crotto is a natural cellar among landslide boulders in Valchiavenna, Lombardy, where a cold airflow keeps a near-constant temperature for aging wine and curing meats.
Crouzet
Crouzet is a French manufacturer of switches, sensors, actuators, relays, and automation controllers, founded in 1921 in Valence and owned since 2022 by a Tikehau-led consortium.
Crow search algorithm
The crow search algorithm (CSA) is a population-based metaheuristic introduced by Alireza Askarzadeh in 2016 that imitates how crows hide and retrieve food to optimize engineering design problems.
Crowd counting
Crowd counting is a computer vision task that estimates the number of people in an image or video frame, often producing a density map showing how the crowd is distributed.