Tetra = four. It is a 3-d shape with 4 faces.
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The name is derived from Greek roots, and so the name, not surprisingly, is "tetrahedron".
Tetrahedron. http://en.wikipedia.org/wiki/Tetrahedron
tetrahedron
A tetrahedron.
A triangular pyramid.
A tetrahedron.
tetrahedron
A tetrahedron.
Tetrahedron
A tetrahedron.
a tetrahedron
A triangle-based pyramid.