PUA (from http://www.unicode.org/faq/private_use.html http://www.unicode.org/faq/private_use.html): Q: What are private-use characters? A: Private-use charact

PUA (from http://www.unicode.org/faq/private_use.html http://www.unicode.org/faq/private_use.html): Q: What are private-use characters? A: Private-use characters are code points whose interpretation is not specified by a character encoding standard and whose use and interpretation may be determined by private agreement among cooperating users. Private-use characters are sometimes also referred to as user-defined characters (UDC) or vendor-defined characters (VDC).