Tested on Windows OS.
ª!!!Attention!!!ª You need Num' ed Keyboard. If you don't have, just buy! :)
So, let's start:
1) Push and hold rAlt.
2) Type "1" on Num keyboard.
3) Then release finger from rAlt
4) Voila! You have ☺ symbol
You can type figures from 0100 to 9999999
But, i suppose, you need copyright symbols, trademark symbols etc.
So:
alt+ 0153= ™
alt+ 0169= ©
alt+ 0174= ®
The most intresting symols are from 0153 to 0250
Go on experimenting!