Io (Greek) The daughter of Inachos, first king of Argos, she was beloved by Zeus and changed into a heifer to avoid Hera's jealousy. Hera, not deceived, had the heifer watched by the hundred-eyed Argos, who was then slain by Hermes at the command of Zeus. After many wanderings in Europe and Asia, Io recovered her form in Egypt and gave birth to the dark Epaphos who became king of Egypt and founded Memphis.
Io means the moon in Argive usage and in Egypt. She is again Isis, Diana, the arc of life, mother of gods and of generations, queen of earth, often symbolized with cow's horns. Dark Epaphos is Dionysos-Sabazios, son of Zeus and Demeter in the Sabazian Mysteries (SD 2:415).
The name shows the stroke in the circle, which stands for the number ten. In Greek it is [[IO]], and in Gnostic gems is [[IAO]] (Iao), sometimes connected with Arbaxas as Abraxasiao. Students of literal symbology have written it Ioh and related it to Jehovah, etc.