icosahedron , its also one of the five platonic solids
others are;
tetrahedron
cube
octahedron
dodecahedron
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Yes because it has many faces which is the meaning of a polyhedron
Cube (hexahedron) has square faces and dodecahedron has pentagonal faces.
It_is_a_triangular_prism.">It_is_a_triangular_prism.">It is a triangular prism.* * * * *While a triangular prism can have equilateral triangle faces, it has more faces that are quadrilateral (or rectangular).A polyhedron with only equilateral triangular faces could be a tetrahedron, an octahedron in the form of a square based dipyramid, or an icosahedron.
A regular polyhedron has equal size faces as in the case of a tetrahedron which is a triangular base pyramid that has 4 equilateral triangle faces.
I am pretty sure it is a triangular prism!