Definition:Class/Zermelo-Fraenkel/Class Variables

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In deriving general results about $\textrm{ZF}$ which mention classes, it is often convenient to have class variables, which denote an arbitrary class.

By convention, these variables are taken on $\mathsf{Pr} \infty \mathsf{fWiki}$ to be the (start of) the capital Latin alphabet, i.e. $A, B, C$, and so on.