To write the Greek Small Letter Upsilon With Dialytika And Oxia symbol ΰ on keyboard using ALT codes; ALT+8163, just hold down 𒉰the ALT key while typing the alt key code 8163. You have to use the numeric keypad of your keyboard. If you don not have numeric keypad, h𒉰old down the Fn and ALT keys while typing the alt code number.