Comment by CodesInChaos
2 years ago
It's a variable width font, so it can be smaller than a fixed 3x3 font.
For example it chose this (ambiguous) encoding for "o":
--
xx
xx
--
where a bigger 3x4 font could choose the overhigh and wider
-x-
x-x
-x-
---
Ah, that explains it – thank you.