No sistar I dont think it is in the bible at all. It is an ancient symbol that predates judaism and it is found in other cultures including even native american tribes.
To answer the question of what it means, that is a deep journey into sacred geometry...
Metatron's cube
Tetragrammaton
In a sense the magen Dawud can mean As Above So Below, but it means a lot more than that alone. Happy exploring, this subject is way too deep to concisely expain, one can study for years and only be beginning to uncover the mysteries.
Selah
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