You likely don't want F580.
You are correct. Apparently F5B0 is not valid.
However hex codepoint 25B6 = dec codepoint 9654 (Block Geometric Shape: Black Right-Pointing Triangle) works with CHAR(9654).
Note the following decimal does
NOT work:
hex codepoint 23F5 = dec codepoint 9205 (Block Miscellaneous Technical: Black Medium Right-Pointing Triangle)
Puzzling. There must be restrictions within MC, having to do with available character sets for the selected font that determine which decimal Unicode symbols work with CHAR(). While the font can be changed in
Options > Tree & View > Select font..., I don't see any information about special character sets other than language encodings.
FYI, I'm experimenting with using the right-pointing triangle to indicate the date [Last Played (Album)] in thumbnail text for the tab "Recently Played" (attached). Other views show the undecorated "date acquired" instead.
2/3/24 Addendum: One approach to finding symbols. Scroll through the Windows Character Map (or try
Insert > Symbol > More symbols... in a Microsoft Office app like Word) for the MC skin font being used (Segoe UI in my case). Select a symbol of interest to find its hex codepoint. Then either convert the hex to decimal base 10 or search the web for that codepoint to find a resource which lists the equivalent decimal codepoint. Try the decimal in CHAR(). Not all available symbols are found this way. For example the Up-Pointing and Down-Pointing Triangles are listed in the Segoe UI Character Map, but the Left-Pointing and Right-Pointing are not listed. To find the latter, I looked at the character map of the closely related font (same family) Segoe UI Symbol.