GNU Unifont was designed to render something besides an empty box
for each visible Unicode character in the Basic Multilingual Plane
(Plane 0). Plane 0 contains most of the world's modern writing scripts.
This font looks best at 12pt.
Complex fonts (such as Indic or Semitic scripts, where letters
change shape depending on their position in a word, or such as
Mongolian, which is written vertically) will not render perfectly.
The philosophy behind this font, though, is that anything meaningful
is better than an empty box for a unknown glyph.