>Is it possible to some how tell the compiler to use
>these symbols even if they aren't in ASCII?
You need to specify what you mean by "tell the compiler". Of course you can write code to make use of different character sets, but it's not as trivial as using the basic character set (which is itself a subset of ASCII in terms of the available character glyphs). There's a whole field of research and development covering that practice, called internationalization and localization. You can also write characters outside of the basic character set directly in your source code if the compiler and text editor support them. So the answer to your question is yes, as with pretty much any "is it possible?" question you can come up with.