Nick Farrell wrote: For a while I wondered why in the Sepher Yetzirah it refers to God by the name יהו instead of the more traditional tetragrammaton. This might be because the writer was using the name in Greek IAΩ. This name was the name given to the Tetragrammaton in the Greek translation of the Old Testament but was also a name given to Jupiter and was a mystical cry in the mystery rites. IAΩ was the letters of the sun, moon and Saturn in Greece, but it was also the first, middle and last letters of the alphabet. Translating it back into the original Greek it starts to make sense in that context. …

Source: Gleamings from the Golden Dawn: Sealing the directions using IAO (reblogged from Nick Farrell)