This property specifies the characters to use.
The CharUsageType enumeration can take any of the following
- SymbolUnicode — enables the range 0xf000–0xf0ff for symbol
fonts. Symbol fonts are usually used in ANSI encoding, and their
characters are in the range 0–255. Since symbol characters do not
represent Latin characters, the range 0xf000–0xf0ff in Unicode is
also mapped to them.