How to print Greek letter delta in c++

I have a small console based application that will solve physics equations. I am trying to ask the user if they want to find the ΔV in a given situation, but I can't figure out how to print the letter delta to the console. Here's my code:

cout << "Select what you would like to find:\n"
<< "1 - Acceleration" << endl
<< "2 - Initial Velocity" << endl
<< "3 - Final Velocity" << endl
<< "4 -  ΔV" << "\n\n";
cin >> choice;

This does not print "ΔV" to the console. The "Δ" doesn't even display in my IDE (Dev-C++), instead being displayed as a question mark. If anyone knows how I can print Δ to the console I would highly appreciate any help you can give me.

Thanks in advance!