For SAS folks answer will be fairly easy one.

Cloud Analytic Services

is the cloud-based run-time environment for data management and analytics in SAS®

But you can hear it more from IT and Ops and it can means something different like:

• Central Authentication Service - is a single sign-on protocol for the web. Not as popular as SAML or OpenID nowadays. It is a valid choice for 9.4 web app authentication and it is used as internal component in 9.4 SAS Logon Manager.
• Container Attached Storage - cloud-native storage solution for applications that preserves state like RDBMS-es or SAS :)

Is is popular acronym so it is better to be precise when using it :)