CES may stand for:

• Closed ecological system, an ecosystem that does not rely on matter exchange with any part outside the system
• Constant elasticity of substitution, an economics production function
• The ISO 639 code for the Czech language
• Ces, the note C♭ in German; it is sometimes used as a designation of key in musical titles, such as Ces-Dur (C flat major)

Technology[link]

• Consumer Electronics Show, a consumer electronics trade show held each January in Las Vegas, Nevada
• Corpus Encoding Standard, an application of SGML for standardizing the encoding of text corpora
• Circuit Emulation Service is an emerging telecommunication technology to transmit legacy TDM or ATM services over Packet Switched Network (PSN) such as Ethernet, IP or MPLS networks
• Customer experience systems, integrated business and operational support systems

Medicine[link]

• Cauda equina syndrome, a serious neurological condition
• Cranial electrotherapy stimulation, a medical therapy used in the treatment of anxiety, depression, insomnia, and drug addiction
• Camurati-Engelmann disease, also called "Camurati Engelmann syndrome" (CES)

Organization[link]

• Center for Economic Studies, University of Munich
• Centre for Environmental Studies, former UK research organization
• Church Educational System, a department of the Church of Jesus Christ of Latter-day Saints
• Coalition for Economic Survival, a Los Angeles based community organization
• Coalition of Essential Schools, an organization created to further a type of whole-school reform
• Common Economic Space
  • Common Economic Space or Single Economic Space, a project of economical integration of Belarus, Kazakhstan, Russia and Ukraine
  • Common Economic Space or Common European Economic Space, one of four projected spheres of cooperation between the EU and Russia
• Community Exchange System, an online buying and selling alternative marketplace originating in South Africa
• Commonwealth Employment Service (now part of Centrelink), the former Australian Government employment agency
• Confédération Européenne de Scoutisme or Confederation of European Scouts
• Centre for European Studies (disambiguation), the name of several educational institutions

People[link]

• Jean Ces, French boxer of the 1920s
• Chloe Ces, Malaysian BTC of the 90s

Software[link]

• CES selector, Material database software from Granta Design Limited

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