At 05:18 AM 8/1/02 -0700, James Kass wrote: >If it will help to understand this issue, here is how it works from >a font perspective. > >The missing glyph is the first glyph in any font. This is mapped to >U+0000 and the system correctly substitutes the glyph mapped to >U+0000 any time a font being used lacks an outline for a called >character. (Unless the application engages in arbitrary font- >switching, which is another story...)
This is not universal among font and systems. My experience on Unix is that U+FFFD is used for the missing glyph. That's the way the Linux console works, and I've never had a complaint that the GNU Unifont displays a diagonal NUL (the U+0000 glyph) rather than the solid rectangle with a question mark in it that's the missing glyph (at U+FFFD).
