A di-tetrahedron.
tetrahedron, a triangular pyramid
tetrahedron
A pyramid.
A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.A triangular dipyramid.
rectangular pyramid
A three-dimensional shape with eight triangular faces is called an octahedron.
A rectangular-based pyramid.
A Pyramid
It is a three dimensional shape bounded by polygonal faces (a polyhedron) which has a uniform triangular cross section, parallel triangular bases, and the remaining faces are rectangular.
A triangular prism.
The shape described is a triangular prism.