To write the 0280ca525e10ca5002904490040006300720079002c002000740065006100720073 Sad Symbol Smiley Face symbol on keyboard using ALT codes; ALT+8.3246443826048E+84, just hold down the ALT key while typing the alt key code 8.3246443826048E+84. 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.