To write the E0f200d1f525 Heart On Fire Heart Symbol Smiley Face symbol on keyboard using ALT codes; ALT+4.5418768097055E+19, just hold down the ALT key while typing the alt key code 4.5418768097055E+19. 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.