Mathematica 4.1 Fonts, to be used for example with a Xft enabled version
of Mozilla or Firefox, in order to display MathML webpages.

With this port, you should also install the port x11-fonts/texcm-ttf.

WWW: http://www.mozilla.org/projects/mathml/fonts/
WWW: http://support.wolfram.com/mathematica/systems/windows/general/latestfonts.html