Other
- Call to Action, a Christian organization
- Call to action (marketing), a web design tenet that requires each page to clearly indicate the desired user response
- Call to arms
- Chicago (band), originally known as Chicago Transit Authority before a lawsuit threat
- Cased telescoped ammunition
- Central technical area, an equipment room used in broadcasting facilities
- Chartered Tax Adviser, a tax accountant who is a member of The Chartered Institute of Taxation (UK)
- Commodity trading advisor
- Criminal Tribes Act, British legislation in India passed in 1871 which labeled entire communities as criminal
- Cryptologic technician administrative
- Children's Television Act, American legislation passed in 1990 that enforces a certain degree of educational television
Read more about this topic: CTA