Is this code just for your personal project? If so, go nuts, use whatever you want.

Is this code meant for others to use? i.e., and open source app of some sort? If so, you're likely just asking for trouble because different programmers use different editors, and you cant be certain all editors will support unicode correctly. Plus not all command shells will show it correctly when the source code file is type'd/cat'd, and you may run into issues if you need to display it within html.