A Javascript Y-Combinator, with proper symbols.

y.js

var Y = function(ƒ) {
	return (function(x) {
		return ƒ(function λ(y) {
			return (x(x))(y);
		});
	})
	(function λ(x) {
		return ƒ(function λ(y) {
			return (x(x))(y);
		});
	});
};
var fib = Y(function(ƒ) {
	return (function(n) {
		return (n == 0 || n == 1) ? n : ƒ(n - 1) + ƒ(n - 2);
	});
});
fib(20);

Because using the unicode symbols makes me feel like I remotely understand what's going on.