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tetrahedron
A tetraheron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. A regular tetrahedron is one in which the four triangles are regular, or "equilateral", and is one of the Platonic solids.
Trivia about tetrahedron
A pyramid is an example of this type of solid in which all 4 sides are the same size
(Jon of the Clue Crew holds a small pyramid.) From the Greek for "four faces", it's a solid like the one seen here