A tetrahedron is a 3-dimensional shape - a triangular pyramid. It is NOT a number.
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There are four number of faces in a tetrahedron.
Four.Four.Four.Four.
You need at least 4 faces for a pyramid. That type is known as Tetrahedron (http:/en.wikipedia.org/wiki/Tetrahedron)
tetrahedron aka triangular pyramid
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.