Full list of Alt codes or Alt key codes to generate special characters ( ᗩᒪ☂ ℃ṎᗪḘṦ ) and symbols such as trademark ™, copyright ©, heart ♥, and accented letters ê on your computer. To use, just hold down the Alt key while typing the alt key code as shown under every symbol below. You have to use the numeric keypad of your keyboard. If you don not have numeric keypad, hold down the Fn and Alt keys while typing the alt code number.