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Upside Down Question Mark ALT Codes

ALT+168

To type upside down question mark ¿ on your computer, Just hold down the Alt key while typing the alt key code 168 on the numeric keypad of your keyboard. If you don not have one, hold down the Fn and Alt keys while typing the alt code number.
Symbols » Alt Codes » Alt Codes ( ᗩᒪ☂ ℃ṎᗪḘṦ )