A Memocorder was a tiny handheld device of Ixian origins that could store written messages. It is in the form of a black square, of Ixian origin. The user writes a message, one word upon another, which gets absorbed into the device.upon it with a glittering needle, with the words being absorbed into the square. The completed message would then be impressed upon the nerve receptors of an acolyte messenger's eyes. Both Moneo Atreides and the Reverend Mother Anteac of the Bene Gesserit used them.