The Lucida font family includes an extensive set of characters for mathematics and scientific publishing. A small sample is shown below.
Lucida Math font sets in OpenType and PostScript Type1 formats are distributed by TUG - the TeX Users Group - and by Personal Tex Inc. - publisher of PCTeX. Both of these external sites provide type specimens, descriptions, examples, and documentation for Lucida Math fonts. Both sites specialize in TeX related math software, but the Lucida Math fonts are in standard formats and can also be used with other applications.
TUG distributes Lucida Math fonts in OpenType and PostScript Type1 formats: http://tug.org/store/lucida/
With additional information here: http://tug.org/store/lucida/lucidaot.pdf
PCTeX distributes Lucida Math font set in PostScript Type1 formats: http://pctex.com/Lucida_Fonts.html
With additional documentation here: http://www.pctex.com/Lucida_Fonts.html#Lucimatx_Documentation