I got into an interesting discussion in a forum where we discussed the naming of variables.
Conventions aside, I noticed that it is legal for a variable to have the name of a Unicode character, for example the following is legal:
int \u1234;
However, if I for example gave it the name #, it produces an error. According to Sun's tutorial it is valid if "beginning with a letter, the dollar sign "$", or the underscore character "_"."
But the unicode 1234 is some Ethiopic character. So what is really defined as a "letter"?