I don't know which font those characters (0F00BE: \udb80\udcbe) include as this seems to be in the Supplementary Private Use Area-A. *https://en.wikibooks.org/wiki/Unicode/Character_reference/F0000-F0FFF You may see text labels or little boxes with the hex code of the character if you do not have a font installed that covers this Unicode range or the font that is used doesn't cover this Unicode range or if you block downloadable fonts or if you do not allow pages to choose their own fonts.