How Do You Make Special Symbols Using Your Keyboard?

Have you ever wondered how people make special symbols on the computer?  Here's a list of the shortcuts!!

I am not certain that they will all work for every application, but I did try several and they worked!  Have fun!

Alt + 0153..... ™... trademark symbol
Alt + 0169.... ©.... copyright symbol
Alt + 0174..... ®....registered ­ trademark symbol
Alt + 0176 ...°......degree symbol
Alt + 0177 ...±....plus-or ­-minus sign
Alt + 0182 ...¶.....paragr­aph mark
Alt + 0190 ...¾....fractio­n, three-fourths
Alt + 0215 ....×.....multi­plication sign
Alt + 0162...¢....the ­ cent sign
Alt + 0161.....¡..... ­.upside down exclamation point
Alt + 0191.....¿..... ­upside down question mark
Alt + 1...........smiley face
Alt + 2 ......☻.....black smiley face
Alt + 15.....☼.....sun
Alt + 12......♀.....female sign
Alt + 11.....♂......m­ale sign
Alt + 6.......♠.....spade
Alt + 5.......♣...... ­Club
Alt + 3............. ­Heart
Alt + 4.......♦...... ­Diamond
Alt + 13......♪.....e­ighth note
Alt + 14......♫...... ­beamed eighth note
Alt + 8721.... ∑.... N-ary summation (auto sum)
Alt + 251.....√.....square root check mark
Alt + 8236.....∞..... ­infinity
Alt + 24.......↑..... ­up arrow
Alt + 25......↓...... ­down arrow
Alt + 26.....→.....r­ght arrow
Alt + 27......←.....l­eft arrow
Alt + 18.....↕......u­p/down arrow
Alt + 29......↔...lef­t right arrow

Do you know of any others?  Add them in the comments!