To write the Greek Capital Letter Eta With Psili And Prosgegrammeni symbol ᾘ on keyboard using ALT codes; ALT+8088, just hold down the ALT key while typing the alt key code 8088. You have to use the numeric 🀅keypad of your keyboard. If you don not have numeric keypad, hold down the Fn and ALT keys wh⭕ile typing the alt code number.