1. The document discusses SignWriting, a writing system for sign languages that is supported by the Center for Sutton Movement Writing. 2. SignWriting uses a grid-based system of glyphs and can be encoded in Unicode, with some sign languages encoded in Plane 15 and others in Plane 16. 3. The Center for Sutton Movement Writing aims to provide standardized, stable, and free specifications for encoding various sign languages in fonts and Unicode for wide accessibility across operating systems and devices.