Hi there,
There is a special LaTeX style for B Symbols (bsymb.sty) from the
RODIN project ... you can download it here:
http://sourceforge.net/project/showfiles.php?group_id=108850&package_id=138165.
Put this in the appropriate location, and then put \usepackage{bsymb}
in the preamble of your document.
Cheers,
Ari