A cube.
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Triangular Prism, Triangular Pyramid.
There is no such shape.
A 10-sided die has 10 triangular faces.
Triangle
Well, any shape with a triangular face. I assume that you mean a shape that only has (identical) triangles for faces. There are 2: the tetrahedron with 4 triangles, and the icosahedron with 20 triangles. * * * * * What about a triangular dipyramid? Two triangular pyramids stuck together along one face?