> I should have said, for PostScript I think that can be a > problem with "symbol" fonts being needed?
Traditionally, Postscript is mostly agnostic with regard to predefined encodings. Glyphs normally have human-readable names, and the standard "show" operator works with strings, which are simply byte-arrays. Translation of the byte-integers into glyphs is done by an encoding vector, which you are free to set up any way you like. So the limit is that you can only work with a maximum of 256 glyphs at the same time, but you can easily switch fonts, and you can also have multiple copies of the same font, each with a different encoding, and switch between those. As to which glyphs are available in a particular font, that's of course up to the font designer to decide.
