IAO

He looked forward and sealed the East, with A I Ω
He looked to the right and sealed the South, with Ω I A.
He looked behind and sealed the West, with Ω A I.
He looked to the left and sealed the north with A Ω I.
He looked below and sealed the deep, with I Ω A.
He looked above and sealed the height, with I A Ω

Excerpt From Greek kind of Sepher Yetzirah

This can serve as a good introduction to meditation using deep or high voice vibrations.