While you can set your own font in your terminal or other tools, it will not change the default "Monospace" font that some applications use.
To change that, edit
~/.fonts.conf
Show archive.org snapshot
and add settings for the "monospace" family. Here is how it looks on my machine now:
<fontconfig>
<match target="pattern">
<test qual="any" name="family">
<string>monospace</string>
</test>
<edit name="family" mode="assign">
<string>DejaVu Sans Mono</string>
</edit>
</match>
</fontconfig>
Fill in "DejaVu Sans Mono" with your preferred font's name.
Posted by Arne Hartherz to makandra dev (2012-11-13 16:57)