To write the Greek Small Letter Upsilon With Dasia And Perispomeni symbol ὗ on keyboard using ALT codes; ALT+8023, 𝔉just hold down the ALT key while typing the alt key code 8023. You have to use the numeric keypa❀d of your keyboard. If you don not have numeric keypad, hold down the Fn and ALT keys while typing the alt code number.