问题
I am trying to display CO2 in a static text control on a .NET application, but on some Windows XP system, the subscript-2 (unicode 2082) appears as a square). I suspect that it may be a font issue as it appears on some Windows XP systems but not on all. It always displays on Windows 7 and Vista. It's available on MS Gothic font. Ideas very welcome.
回答1:
MS Sans Serif doesn't contain Unicode character U+2082, therefore the glyph will only be rendered as a square. To solve the problem you need to use a character where U+2082 is available.
You can check all available characters with Window's charmap.exe utility. MS UI Gothic for instance contains this character, as well as Segoe UI or Arial Unicode MS.
来源：https://stackoverflow.com/questions/3081137/why-does-subscript-2-not-appear-on-windows-xp