unicode fractions for barre indications

[Federico Bruni]

I'd like to use Unicode characters to indicate all the possible 
semi-barré on a six string guitar: on two, three, four or five strings.

I've checked this list:
http://en.wikipedia.org/wiki/Number_Forms

And I could find only ⅚
There's any way to have 2/6, 3/6 and 4/6 as Unicode?

Thanks
--
Federico