The word "tetrahedron" comes from ancient Greek. The shape can be observed in methane molecules which exist in outer space and are much older than the Solar system. So tetrahedra are at least 4 billion years older than human beings!
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A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.
Well, a tetrahedron has four sides. A regular tetrahedron is a triangular pyramid.
A Tetrahedron. The most common form of a tetrahedron is called a regular tetrahedron, or a pyramid
A tetrahedron has 4 vertices.
A tetrahedron need not have any symmetry.