The latest version of the GNU Unifont now adds Yi Syllables and Yi
Radicals (U+A000..U+A4CF). I've been told that this is probably the
first set of open-source Yi glyphs.

This version can be downloaded at

It is available as two z-variants: one with the Japanese ideographs
from Roman Czyborra's original unifont.hex file, and another with
ideographs placed in the public domain by the People's Republic of

The BDF file at that URL contains all glyphs. To run properly with
xterm, it should be divided into two files: one for single-width
glyphs, and one for double-width glyphs.

Paul Hardy