A ditetrahedron (two triangular pyramids stuck together base-to-base) or, more boringly, a cube.
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It is a cube
a rectangular prism
A TETRAHEDRON has four congruent triangular faces four vertices six edges. "Tetra" means "four" in Greek "Hedron" means "sided"
Triangular prism. 9 faces, six vertices, and nine edges right?
A cube always has six congruent faces and eight vertices.