I wish there were a great monospace font with extensive Unicode symbol support. DejaVu seems to support a lot of math symbols. But it's far from being perfect.
My favourite fonts Inconsolata and Adobe Source Proc support barely anything beyond latin1. So I usually end up with some ugly font mix due to fallback.
(Of course if you want all of Unicode and hate yourself there is GNU Unifont. edit: Just checked and Unifont only supports all of BMP.)
Replying to myself... For anyone interested, here are two screenshots showing the Mathematical Operators blocks of Liberation Mono and Droid Sans Mono in the current Debian Sid:
My favourite fonts Inconsolata and Adobe Source Proc support barely anything beyond latin1. So I usually end up with some ugly font mix due to fallback.
(Of course if you want all of Unicode and hate yourself there is GNU Unifont. edit: Just checked and Unifont only supports all of BMP.)