A tetrahedron. Or if has five faces in all, a quadrilateral based pyramid.
That would be a tetrahedron.
It has 4 faces
triangular pyramid
A triangular pyramid.
A tetrahedron
It is a tetrahedron which is a triangular based pyramid
a triangular pyramid
a triangular pyramid has six edges and four triangular shaped faces
a triangular pyramid
triangular pyramid
your mums nickers
tetrahedra (a pyramid with a triangular base)
Triangular pyramid