[Braillenote] underscore

[Maria Kristic]

Hi Everyone,
I was wondering if it was possible to make an underscore character in the BN.  
If so, how is this done? I'm using a BT, and when I searched for "underscore" 
in the Unicode Tables, I didn't find anything.  I'm not sure what to search 
for, or which table to look in.  I don't even know how to make an underscore in 
Grade 2, much less Computer Braille.  I don't even know if it's possible, but 
any help would be much appreciated.  Thanks.
Sincerely,
Maria