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Combined Defence Services Examination
The Combined Defence Services Examination (CDS) is a twice-yearly UPSC examination selecting graduates for officer training at India's military, naval, air force, and officers' training academies.
Combined diesel and gas
Combined diesel and gas (CODAG) is a marine propulsion system where diesel engines and a gas turbine drive the same propeller shaft for efficiency and speed.
Combined DNA Index System
The Combined DNA Index System (CODIS) is the FBI's program of DNA databases that lets forensic laboratories exchange profiles and link crimes to known offenders.
Combined finite-discrete element method
The combined finite-discrete element method (FDEM) is a computational mechanics technique, reported in 1995, that models deformable finite elements fracturing into discrete bodies that interact through contact.
Combined sewer
A combined sewer is a sewer system that carries sanitary sewage and stormwater through the same pipes, so heavy rain can trigger combined sewer overflows of untreated sewage to rivers.
Combined sewer overflow
A combined sewer overflow (CSO) is the discharge of untreated wastewater and stormwater into rivers, lakes, or coastal waters when rainfall exceeds the capacity of a combined sewer system.
Combiner box
A combiner box is a weatherproof enclosure in a photovoltaic system that connects several solar panel strings in parallel, with fuses, surge protection, and a disconnect.
Combustion
Combustion, or the combustion reaction, is a rapid exothermic reaction between a fuel and an oxidizer, usually oxygen, releasing heat and light, as in fires and engines.
Combustion Engineering
Combustion Engineering, Inc. was an American company founded in 1912 and headquartered in Windsor, Connecticut, that built fossil-fuel boilers and nuclear steam supply systems before its 1990 acquisition by ABB.
Combustion instability
Combustion instability is a self-sustained pressure oscillation arising from coupling between acoustic waves and flame heat release, a danger in rocket engines, gas turbines, and aeroengines.
Combustion tap-off cycle
The combustion tap-off cycle, or tap-off cycle, is a liquid rocket engine cycle that taps hot gas from the main chamber to drive its turbopumps, eliminating the gas generator.
Comcast
Comcast Corporation, trading as CMCSA, is an American media and technology company in Philadelphia, delivering broadband, wireless, video, and voice through Xfinity, Sky, and NBCUniversal.
Comeng (train)
Comeng is the common name for Melbourne's suburban electric multiple unit fleet built by Commonwealth Engineering in Dandenong, in service from 1982 and replaced by X'Trapolis 2.0 trains by about 2030.
COMESA electricity market
The COMESA electricity market is the framework for cross-border power trade among the 21 member states of the Common Market for Eastern and Southern Africa.
Comet (browser)
Comet, also known as Perplexity Comet, is an AI-powered web browser developed by Perplexity AI on the Chromium engine, announced in July 2025 and released free that October.
Comet (tank)
The Comet, formally A34, was a British cruiser tank of the Second World War, armed with the 77 mm gun and regarded as Britain's best tank of the war.
Comet Interceptor
Comet Interceptor is an ESA and JAXA mission, selected in 2019, that will launch in 2029 without a target and wait for a pristine comet.
Comet Lake
Comet Lake, also known as Intel Comet Lake, is the codename for Intel's 10th-generation Core processor family, built on a refined 14 nm process and released in 2020.
COMEX
COMEX (Commodity Exchange) is a United States futures exchange for metals, founded in New York in 1933, where the benchmark gold, silver, and copper futures contracts trade under CME Group.
Comfort A. Adams
Comfort A. Adams was an American electrical engineer and Harvard educator who designed the first a-c welding transformers, used on the Boulder Dam penstocks, and won the 1956 Edison Medal.
Comfort Inn and Suites
Comfort Inn and Suites is a family of franchised hotel brands owned by Choice Hotels International, launched with the first Comfort Inn in Atlanta in 1981.
ComfyUI
ComfyUI is an open-source node-graph interface and backend for building image, video, audio, and text generation pipelines on diffusion models, released in 2023 by Yannik Marek.
Comgás
Comgás (Companhia de Gás de São Paulo) is a Brazilian piped natural gas distributor serving 177 cities in São Paulo state, privatized in 1999 and majority-owned by Cosan.
Comisión de Regulación de Comunicaciones
The Comisión de Regulación de Comunicaciones (CRC) is Colombia's converged regulator for telecommunications, postal services, broadcasting, and audiovisual content, created under Ley 1341 de 2009 with administrative and financial independence.
Comisión Federal de Electricidad
Comisión Federal de Electricidad (CFE), or Federal Electricity Commission, is Mexico's state-owned electric utility. Created in 1937, it supplies most of the country's electricity and was reconstituted by a 2024 constitutional reform.
Comisión Federal de Telecomunicaciones
The Comisión Federal de Telecomunicaciones, known as Cofetel, was Mexico's telecommunications regulator from 1996 to 2013, created under President Ernesto Zedillo as a decentralized organ of the SCT.
Comisión Nacional de los Mercados y la Competencia
The Comisión Nacional de los Mercados y la Competencia (CNMC) is Spain's independent regulator for competition and key sectors including energy, telecommunications, and transport, created in 2013.
Comisión Nacional de Telecomunicaciones (Venezuela)
The Comisión Nacional de Telecomunicaciones, known as Conatel, is Venezuela's telecommunications regulator, created in September 1991 to grant licenses, manage the radio spectrum, and approve tariffs.
Comisión Reguladora de Energía
The Comisión Reguladora de Energía (CRE, Energy Regulatory Commission) was Mexico's federal regulator for natural gas and electricity, created in 1994 and replaced by the CNE in 2025.
Comissão Nacional de Energia Nuclear
The Comissão Nacional de Energia Nuclear (CNEN, National Nuclear Energy Commission) is Brazil's federal autarky for nuclear energy, created in 1956 and seated in Rio de Janeiro.