I am looking for a way to label fonts using a particular Unicode position. (This is for testing web fonts - testing exactly which font file in the @font-face stack the browser is displaying. In other words, is it the EOT, the WOFF, the SVG, the Data URI - which one is the browser using?)
The question is: Which Unicode position to use for this purpose? (Latin-centric.)
The main boundary condition is that there be a near zero chance of conflict with a glyph that already exists in the font. And if there is a conflict, that there be no unwanted side effects stemming from simply replacing it with the marking glyph.
Right now, the best candidate seems to be the Apple logo from the MacRoman codepage with a position in the Private Use area, Unicode 63743 (U+F8FF).
Anybody see a problem with this?
Anybody have a better idea?