What are standard Terms and Conditions?
“Terms and Conditions” is the document governing the contractual relationship between the provider of a service and its user. On the web, this document is often also called “Terms of Service” (ToS), “Terms of Use”, EULA (“End-User License Agreement”), “General Conditions” or “Legal Notes”.
How do you write TS and CS?
When you can capitalise the initials, they become much easier to deal with. Ts & Cs, or Ts and Cs if you prefer, is perfectly readable. Using apostrophes (T's & C's) just adds unnecessary clutter. So in this case, you're better off without.