Hieroglyphics of Horapollo, tr. Alexander Turner Cory, , at sacred-texts.com
To denote a disappearance, they delineate a MOUSE 1, because
it pollutes and spoils all things by nibbling them. They also make use of the same symbol when they would denote discernment, for when many different sorts of bread lie before him, the mouse selects the purest from among them and eats it. And hence the selection by the bakers is guided by mice.