I'm on a laptop and I can do it. ♥☻♣○◘☺•
This is what you do:
1) First press and hold the "Fn" that's in a box button
2) Press and hold alt
3) Press and hold a letter with a number in a box above it. (ex. J, K, L, U, I, O)
Voila! Now you should have a symbol
Edit: I just noticed...