The characters of FSW are compatible with and optimized for UTF-8.
Signs are written as SignWriting words with mathamatical names of ASCII characters from the set: ABLMRS0123456789xabcdef. Stable since January 2012.
The characters of SWU are an experimental Unicode design intended for use with one-dimensional fonts and two-dimensional fonts.
Signs are written as SignWriting words of Unicode characters. This character set overwrites the Sutton SignWriting Block (U+1D800 - U+1D9FF) and uses Plane 4 for the Sutton SignWriting symbols.