In math, one says "let $G$ be a group", "let $A$ be an algebra", ...

For groups, the typical letters are $G$, $H$, $K$, ...
For algebras, the typical letters are $A$, $B$, ...

I want to say things such as "let xxx be a conformal field theory"

and "let xxx $\subset$ xxx be a conformal inclusion".

Which letters should I use?

What is the usual way people go about this?

Here, I'm mostly thinking about chiral CFTs, but the question is also relevant for full (modular invariant) CFTs.

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