tetrahedron
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The Platonic solids in modern Euclidean geometry are five regular polyhedra. These are three-dimensional objects that are bounded by regular polygonal faces. They are: Tetrahedron (or triangular pyramid): 4 triangular faces; Hexahedron (cube): 6 square faces; Octahedron: 8 triangular faces; Dodecahedron: 12 pentagonal faces; Icosahedron: 20 triangular faces. See link for more.
A triangular prism has 5 faces.
A triangular prism
the trianagular pyramid has 5 faces the triangular prism has 6 faces
A tetrahedron is a polyhedron with four triangular faces, while a triangular prism is a polyhedron with two triangular faces and three rectangular faces. The main difference between the two shapes is their number of faces and their base shapes. Additionally, a tetrahedron has four vertices and six edges, while a triangular prism has six vertices and nine edges.