This word has several distinct uses based on its geometrical shape:
Mathematical: A three dimensional triangular shape with a meeting of the angles at the apex. Archaeological: Egyptian, Mayan and Inca pyramids. The most famous pyramid is the Great Pyramid of Cheops. Organizational: A pyramid structure is a hierarchical organization more people in lower positions and fewer in senior positions above them. Pyramid schemes: Schemes where a few people sell bogus entitlements to larger numbers for rewards.
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