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I am reading a book on hydrogen energy (handbook of hydrogen energy), and came across the following compound on the Cu-Cl thermochemical cycle: $$\ce{CuO\text{*}CuCl_2(s)}$$

What exactly is the role of the "*" symbol here, how can I better understand this compound?

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${CuO*CuCl_2}$ is another way of writing $\ce{CuO*CuCl2}$. This substance is a stoichiometric mixture of $\ce{CuO}$ and $\ce{CuCl2}$. The symbol asterisk (*) is often used in chemistry instead of the point or dot (·) , especially when using machine languages like LaTeX.

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    $\begingroup$ I'd argue that using correct typography is one of the strengths of latex. I've never seen anyone deliberately using an asterisk instead of a center dot. $\endgroup$
    – Martin - マーチン ♦
    Commented Aug 4, 2023 at 0:03

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