I want to use the symbol ƀ (b with stroke) in my document. I use it for the blank symbol in the formal definition of Turing machines.
I use XeLaTeX, so I should be able to use the Unicode symbol, but I don't know how to enable the font for it in math mode.
Right now, I use the following, which works, but is quite ugly:
What do I need to do in order to use the Unicode character in my document?