CharMap in Ubuntu 11.04 for lydian not showing up the correct character set. I checked couple of different character sets(Javanese), its showing up the same boxed hexdecimal values.
Obviously your font has no support for this codepoint. The site FileFormat.info is a good resource to find information about Unicode characters and fonts. If you look up the Lydian letter G (U+10922), you'll find some general information. Furthermore there is a link »fonts that support U+10922«. Here you find 4 fonts which support this lydian letter. I chose as an example Quivira. You can download the TrueType font file (
The letter looks like: