Science and Medicine
- Calcium sulfide (CaS), a chemical compound
- Cassiopeia (constellation) (Cas), standard astronomical abbreviation
- Chemical Abstracts Service, a division of the American Chemical Society which produces bibliographic and chemistry databases
- CAS registry number, unique numerical identifiers for chemical substances
- Cognitive Assessment System, an academic assessment test given to children
- Complex adaptive system, special cases of complex systems
- Computer assisted surgery, use computer technology in surgery
- Hartley kernel, which also is known as the cosine and sine function
Read more about this topic: CAS
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