>>628　http://www.unicode.org/unicode/standard/principles.html
The Unicode Standard also reserves code points for private use.
Vendors or end users can assign these internally for their own characters and symbols, or use them with specialized fonts.
There are 6,400 private use code points on the BMP and another 131,068 supplementary private use code points, should 6,400 be insufficient for particular applications.
となっていますが、何か?