The following are all examples of valid JavaScript variable names.
// How convenient!
var π = Math.PI;
// Sometimes, you just have to use the Bad Parts of JavaScript:
var ಠ_ಠ = eval;
// Code, Y U NO WORK?!
var ლ_ಠ益ಠ_ლ = 42;
// How about a JavaScript library for functional programming?
var λ = function() {};
// Obfuscate boring variable names for great justice
var \u006c\u006f\u006c\u0077\u0061\u0074 = ‘heh’;
// …or just make up random ones
var Ꙭൽↈⴱ = 'huh’;
// While perfectly valid, this doesn’t work in most browsers:
var foo\u200cbar = 42;
// Fun with Roman numerals
var Ⅳ = 4,
Ⅴ = 5;
Ⅳ + Ⅴ; // 9
http://chouchen.tumblr.com/post/20644189238/the-following-are-all-examples-of-valid-javascript
