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From the interweb:
The term Merkabah, or Merkavah, has multiple meanings, including a Jewish mystical practice, a Hebrew word, and a symbol:
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Jewish mystical practice: Merkabah mysticism is a school of Jewish mysticism that focuses on visionary experiences of ascending to the heavenly realm and the Throne of God. The term comes from the Hebrew word for "chariot" and is attributed to the Old Testament prophet Ezekiel. Merkabah mysticism was a cornerstone of Jewish mysticism from around 100 BCE to 1000 CE.
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Hebrew word: The Hebrew word Merkabah means "chariot" or "vehicle". It can also be interpreted to mean "light, spirit, body".
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Symbol: The Merkabah symbol is a three-dimensional energy field created by two intersecting tetrahedrons that spin in opposite directions.
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Israeli main battle tanks: The Merkava is a series of Israeli main battle tanks.
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Song by Tool: "Merkaba" is a song by Tool from their 2000 box set Salival.
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Stellated octahedron: Some contemporary mystics refer to the stellated octahedron as a "merkaba".