Its mind boggling to see so many sites and so many religious sects talking about exactly the same thing. Science will eventually unite all religions.

When I experienced the triangle made from the third eye to the heart chakra and then extend upto my hands resting on my knees, when I was sitting in the meditation crosslegged on my meditation bed, I was blissfully shocked as I had no knowledge of triangles. I didn't know what place triangles had in a real meditation session. I only ever thought they are drawn to make the mind concentrate on a point. I had never used those figures to concentrate as I meditate with my eyes closed.

Here are a few websites about triangles.

http://www.cosmiclight.com/oflightandlife/metaphysics.htm