It seems odd that the codes are neither in medal order nor in alphabetical order. I wonder what the rationale was for putting bronze and copper before silver but after gold.

But they are not listed as those metals in The Unicode Standard.

Those allocations as metallics are my own ideas.

I chose to list them so as to be in both medal order and symbols on a page order (as in English usage) and that meant that they are not, in practice, in the same order as in The Unicode Standard.

William

https://www.unicode.org/reports/tr51/tr51-27.html#color

I wonder if that could be extended so that four characters from

https://www.unicode.org/chartU+25F1 s/PDF/U25A0.pdf

are used to indicate metallics.

U+25F0 for gold
U+25F3 for silver
U+25F1 for bronze
U+25F2 for copper

Please note that these are not listed here in the same order as in the code chart.

This is so that the small square in these symbols when used as in this suggestion for the metals go in "medal order" like reading words on the page of a book.

William