A name synonymous with IHJH, or the Tetragrammation, of the Hebrew Mysteries. Among the Gnostics Iao was a mystic symbol for the Supreme Divine World. Also the name was that of the Supreme Being.
This mystic symbol for the Supreme Divine World also was used among the ancient Chaldeans and Phoenicians. It is a name so sacred as not to be spoken.
Also, the polar male and female symbol which this mystic name represents was worn by the initiates of the Serapis–an Egyptian- Grecian-Roman deity
The name Ioa also is found in Polynesian mythology meaning Supreme Being. A.G.H.
Source: 2.