"A pyramid (from Greek: \u03C0\u03C5\u03C1\u03B1\u03BC\u03AF\u03C2 pyramis) is a structure whose outer surfaces are triangular and converge to a single point at the top, making the shape roughly a pyramid in the geometric sense. The base of a pyramid can be trilateral, quadrilateral, or any polygon shape, meaning that a pyramid has at least three outer triangular surfaces (at least four faces including the base)."@en . . . .