Jali

Hexagram surrounded by six hexagons in a grid called Jali (indian term of "mashrabia").
Picture (taken at Humayun Tomb, India) is courtesy of "mattlogelin" who published it on Flickr.

Ten Thousand Years Old Yantra

Picture is courtesy of Suzanne Olsson who published it her Website together with an article about THE STAR OF DAVID where she wrote:

The above yantra was carved nearly 10,000 years ago into a rock near Adam's Peak in Sri Lanka. Adam was thought to have visited there, and Noah was believed to have brought the remains of Adam and Eve on the Ark for reburial. If the star was first associated with Hebrews that far back, then Solomon was not the first priest-king to continue it as a family symbol. This leaves several ways the Star symbol was brought into India and became the yantra.

I sent her an email asking for the sources for this photo and she answered me:

I have lost the source that dated the black rocks in Sri Lanka and India...I recall it was the Department of Antiquities in India....it's been about five years since I first came across the information...I wish I had saved the sources...You might be able to recover them eventually through internet searches...

Six Is the Number of Man, Seven Is the Number of God

"Whtstealth" published a very elegant and ORIGINAL graphic explanation for the meaning of the shape of the Star of David on Youtube.
Here are some interesting excerpts from the debate that was developed after he published the clip:
"upsilone" commented (1 month ago)

The Star of David exists for more than 5000 years ago. It existed even before the ancient Hebrew letters were invented…

whtstealth’s Reply (1 month ago):

So what is your point? We do not live in that time now, furthermore 'Do you actually have proof of the origin of the Star of David?' 

I sent the link to this clip to my friend Craciun Lucian and he commented:

That's not a "seven", that's a Gimmel. Plus the two big Daleths ==> 6*3+2*4 = 18+8 = 26, the numerical value of the Tetragrammaton. Also, six Gimmels + six little Daleths = 6*(3+4) = 6*SEVEN = 42. (Six=man; seven=God).
…Arabic numerals, adopted relatively late in human history by Europeans & Middle-Easterners. [The Jews had one numerical system, the Latins another, and the Greeks had equivalents for both -- but something like ten-base Arabic numerals were inexistent (not that there aren't similarities, but these similarities do not account for the number seven having that particular form {"7"}, neither do they permit a summing of the ciphers of the number, since they {Latins, Greeks, Jews} didn't have ciphers, but reserved different letters for -let's say- 6, 60, 600; or 9, 90, 900)].