⇔ Left Right Double Arrow Arrows Symbol Smiley Face U+21D4

How to Write the Left Right Double Arrow Symbol ⇔ on Keyboard?

To write the Left Right Double Arrow symbol ⇔ on keyboard using ALT codes; ALT+8660, just hold down the ALT key while typing the alt key code 8660. 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.