- Anfa Airport in Casablanca (IATA location identifier)
- Calibrated Airspeed , the airspeed shown by an airspeed indicator
- Casualty Actuarial Society
- Central Authentication Service , a single sign-on protocol
- Certified Annuity Specialist
- Changing Armour System, used by the Liger Zero and Berserk Führer , fictional mecha from the Zoids universe
- Channel Associated Signaling , a type of communication signaling common for digital PBX
- Chemical Abstracts Service , CAS Registry Number
- Chief Of The Air Staff , in some Commonwealth nations, the professional head of the air force
- Children's Aid Society
- Chinese Academy Of Sciences
- Cinema Audio Society , a professional organization for sound Mixers from film and television
- Civil Aid Service , a Hong Kong Civil Aid agency
- Close Air Support
- Column Access Strobe / Column Address Select, a term relating to Computer Memory , ''see'' CAS Latency
- Combat Armor Suit , also known as powered armor
- Combined Associated Schools , An association of private schools in Sydney
- Compare-and-swap , a special CPU instruction
- Complete Active Space , in quantum chemistry, a type of classification for the molecular orbitals
- Complex Adaptive System
- Computer Algebra System
- Computer-assisted Surgery
- Computer-aided Surgery
- Concentration, Asymmetry, Clumpiness , a method of classifying galaxy morphologies
- Conditional Access System
- Contemporary Art Society
- Content-addressable Storage , a data storage mechanism
- Corporate Audit Services , a consulting department in a financial institution
- Court Of Arbitration For Sport
- Cowboy Action Shooting
- Creativity, Action, Service , the community service aspect of the International Baccalaureate Diploma Programme
- Cybercafé Administration Server , a software tool
can mean:
- The people who were living south of the Caspian Sea and north of the Alborz mountains. ( Gilak or Gilek ) are their descendants. Cases were people with light hair and blue or green eyes. In the Gileki language, '''caas-e-chum''' means blue or green eye.
- Cassiopeia (constellation) , standard astronomical abbreviation
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