What unusual characters in addition to $ are allowed in JavaScript identifiers?

Question

I want a variable like $ that is sort of special, but I'm already using jQuery, so $ is taken.

Answer 1

Unfortunately, older javascript supports letters, numbers, underscores, and $ in identifiers. In javascript 1.5 and later you can use Unicode characters, but that would be a very bad idea as they can be a pain to enter into most editors, and certainly aren't something you would want to have to type very often.

Source