I find it both heart-warming and mind-expanding to learn about a new writing system... But this one, well... we're reaching a whole new level!
A little while ago an experienced linguist working with sign languages around the world sent me information about an open font project designed specifically to enable sign language writing systems: ISWA 2008 (International SignWriting Alphabet).
The writing systems implementation (in which this font is a key element) uses a combination of iconic symbols to represent face, hands and body movements with meaning: it's called SignWriting.
And you have to recognize that the authors have their licensing strategy well thought out for maximum distribution and collaboration: GPL 3 for the software, OFL 1.1 for the fonts and CC BY-SA (Attribution-ShareAlike) 3.0 for the content. IHMO a great combination indeed!
Pretty amazing to see such a collaborative Free Software approach helping enable yet another writing system to be created and widely used. Sounds like a great step forward to bring increased literacy and means of expression to the deaf communities :-)
Now to learn some signs and try to write them down...