A hexagon based pyramid.
A tetrahedron has four equilateral triangles as sides
A 3D shape with all triangular faces can be a tetrahedron pyramid.
The two congruent 3D triangles were equal in shape, size, length and volume.
A cube satisfies that description.
A triangular pyramid.
The simplest such shape is PYRAMID.
a duodecahedron is one 3D shape that has triangles, and so is an icosahedron. there are others, but they have very long names