Answer:
Press NUM LOCK, then hold down alt, while holding down alt on the number keyboard to the right (under num lock) press 3 once. It should come out like this: ♥ . Others are
♫ ( press numlock, hold down alt, and press 2 six times)
☻( same except press 2 once)
♣ (same ecept press 3 four times)
Or you could use <3, as the above method doesn't work for some people.