Here is a link for an Alt Codes Reference Sheet, with Alt Codes, and instructions for how to enter them.
These work for MoI text entry, under Windows. (What about Macs?)
(What about if the keypad has been used for shortcuts?)

I have only tried out alpha and omega:-)
αßΓδΩ♥▼

Partial instructions:
Alt codes work on computers running any of Microsoft's Windows operating systems.
1.Find the Alt Code you need from the alt code tables on this site or from the downloadable Alt Code list.
2.Make sure that "Number Lock" is switched on.
There should be a light on your keyboard indicating this.
If not, press the "Number Lock" key at the top left of the numeric keypad.
•Hold down the "Alt" key to the left of the space bar and key the code on the numeric keypad.
Don't release the "Alt" key until after you've typed the alt code. When you release it you should see the special character you include.

Instructions for entering Alt Codes on a lap top
Even if you have a laptop or a keyboard with no numeric keypad - you can still use alt codes...(see link)

http://usefulshortcuts.com/alt-codes/instructions-for-using-alt-Codes.php

http://usefulshortcuts.com/downloads/ALT-Codes.pdf

- Brian