I've always wondered how someone got a ♪ to show up on what they were typing... so now I know alt key and 1 3. And all these others. Just press the ALT key and then the number on the keypad to the right.
™ is the 0153
© is the 0169
® is the 0174
° is the 0176
± is the 0177
¶ is the 0182
¾ is the 0190
× is the 0215
¢ is the 0162
¡ is the 0161
¿ is the 0191
☺ is the 1
☻ is the 2
☼ is the 15
♀ is the 12
♂ is the 11

Pretty cool huh? there are more.
♠ is the 6
♣ is the 5
♥ is the 3
♦ is the 4
♫ is the 14
√ is the 251
↑ is the 24
↓ is the 25
→is the 26
← is the 27
↕ is the 18
↔ is the 29

There are a couple more that don't work on my computer. they are:
Nary summation which is 8721
and infinity which is 8236
Try these out for yourself! You'll at least have a little fun!