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The seven-pointed star is called a "heptagram." In Neopaganism, it is often called the Elven or Fairy star; the seven points represent air, fire, water, earth, above, below, and center. In Christianity, the heptagram represents the seven days of creation.
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Tip: the points of the star are sharp; be careful! You may want to file them down. The height of the heptagram is about 3/4" (20 mm).