Other
- CST element, a type of element employed in finite element analysis
- Canada Social Transfer, a transfer from the Canadian federal government to provinces and territories in support of social programs
- Child sex tourism
- Catholic social teaching
- centiStoke, a unit of kinematic viscosity
- Central Sandinista de Trabajadores, the Sandinista Workers' Centre
- Certified Sex Therapist (through the American Association of Sexuality Educators, Counselors and Therapists)
- Chicago Shakespeare Theater
- Civil Support Team
- Collective Security Treaty Organisation of the Commonwealth of Independent States
- Community Security Trust (a Jewish organisation in Britain)
- Concentrated solar power, also known as concentrated solar thermal
- Concrete syntax tree
- Constitution Party (United States)
- Consular Systems and Technology, a division of the U.S. Bureau of Consular Affairs
- Council for Science and Technology of the UK government
- Cox Sports Television
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