Here’s some more from
http://www.sutrajournal.com/vettavel...shall-govindan ~
“The Yoga Siddhas prescribed a more direct method: concentrating on a point of light, known as bindu, or on the sacred syllable Aum, particularly between the eyebrows, and then allowing our consciousness to expand. The result of this practice is the realization of vettaveli (vast, luminous space).”