Fixed width fonts from the Linux Font Project.
You'll have to add /usr/X11R6/lib/X11/fonts/lfpfonts-fix
to your X font path by either:
$ xset fp+ /usr/X11R6/lib/X11/fonts/lfpfonts-fix
$ xset fp rehash
or by adding it to your X-server configuration file (usually
/etc/X11/XF86Config) and restarting the X-server.