Review my project: Using unicode to break Twitter's 140 char limit
shiro: Haha, it's clever.  Did you limit the list of compressable characters by frequency?  Since there seem more of them; U+3370-33DF range (from which you took 'ms', 'ns', 'cc' etc) also has 'da', 'bar', 'in', 'log', 'mil', 'mol', 'ha', 'gal' etc.  Also U+32CD 'erg'
U+2480-249B and U+1F101-1F10A has digit(s) + punctuation (i.e. '1.' ... '20.' and '0,' ... '9,')I wonder how these play with searches, though.