For some reason, I didn't see this thread when it was first posted...
I nearly mistakenly read Ravenswing's mention of the stellated dodecagon for the stellated dodecahedron - and in light of Fulgour's recent mention of Tycho de Brahe (which instantly calls to mind also Kepler), it is, I suppose, understandable. For the record, the stellated dodecahedron is a three dimensional figure made from inter-linked pentagrammes.
The stellated dodecagon is the way in which 'standard' astrological charts which seek to demonstrate the zodiacal elemental triplicities depict it: the three Earth signs connected by an Earth equilateral triangle, the three Water signs likewise, and so on for the signs of Air and of Fire.
In terms of TemperanceAngel's original question, the link which Fulgour gives is one of the best I have seen... for numerous reasons.
In terms of Kabbalah per se, there are some who would say that the hexagramme itself is not directly there to be placed or understood - though it is an incredible mathematically precise symbol from which the five platonic solids can be represented in two-dimentional form (I'll show you what I mean at a Tarot Café, if you like).
Others place the same as part of the structure of the Tree of Life - and in that sense connect it to the Kabbalah.
Numerically, sometimes numbers are placed around its points (clockwise from the top: (1), 2, 3, 4, 9, 8), giving an odd and an even numbered triangle in their traditional gender allocated value, with the total, 26 (+1 in brackets and thus not added), in the centre, being also the value of the letters of the Tetragrammaton (IHVH).
The hexagramme is also one of the simplest of symbols to depict the hermetic maxim: as above, so below, and as below, so above, as well as a symbolic representation of the alchemical union between male and female, between King and Queen.