From the Wikipedia entry on quantum logic
A more modern approach to the structure of quantum logic is to assume that it is a diagram – in the sense of category theory – of classical logics (see David Edwards).
What does the author mean by the statement it is a diagram... of classical logics?
What is a diagram?
I don't know category theory; I need to know only the gist of a meaning (precision isn't especially important). Accordingly, a plain-language answer would help the most.
Thank you,
-Hal