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In Webster's Dictionary, we read: "Solomon's Seal, a mystic talismanic symbol in the form of an interlaced outline of either a five pointed star or six-pointed star." (Random House Unabridged Webster's Dictionary, Second Edition, page 1817, where the six-pointed star is illustrated.)

"The interlacing triangles or deltas symbolize the union of the two principles or forces, the active and passive, male and female, pervading the universe.... The Two triangles, one white and the other black, interlacing, typify the mingling of the two apparent powers in nature, darkness and light, error and truth, ignorance and wisdom, evil and good, throughout human life." (Encyclopedia of Freemasonry, Albert G. Mackey, 33rd Degree Freemason, and Charles T. McClenachan, 33rd Degree Freemason, p. 801.)

As the scan of two pages from a book on the Jewish Qabalah attests, the same Seal of Solomon that's used in Freemasonry is also used by Kabbalists and has the same meaning. The scan above is from Gonzalez Whippler's book "Kabbalah for the Modern World", where she describes the double triangles of Solomon's Seal in the same way as it's described in Freemasonry; that is, one triangle represents water, the other triangle represents fire, i.e., the triangles represent opposite principles in nature.

Also see Double Triangle of Solomon, Hexagram, Star of Remphan,