Simple to enter Unicode character that would sort after Z in most cases?

As you probably know most symbols are sorted before the alphabetical letters.

I am looking for one character that is easy to enter from the keyboard that would be sorted after "z" by most sort implementations.

If this is also an ASCII character, the better :)

Any ideas?

On a Mac, these are the only characters I can type using a US keyboard (with and without shift and option modifiers) that sort below Z and z:

• Ω (option+z)
• π (option+p)
• µ (option+m)
•  (shift+option+k)

It seems like omega and then pi are the best options for cross-platform compatibility.