Unicode/character name for quest item button dot/period

[sh77]

Does anyone know the unicode or character name for the dot/period that appears over quest item buttons? You know, the one over the icon that's red when you're out of range but grey in range?

It appears OK with default fonts, but custom fonts don't have this glyph, displaying a pretty ugly rectangle instead. It looks like a large-ish raised dot.

Easily fixed I guess with a font editor, but I'm really struggling to find the exact character.

Thanks.