I answered a part of this question in the Linux forum.
You need to learn the difference between character sets and fonts. If the font you're using doesn't have a glyph for a given character, the system will try to represent the character using glyphs that it has that have (to whoever built the tables) as close a visual meaning or representation to the desired character.
In general, on these boards at least, you should not post the same question in multiple places. It makes some people quite angry.
