A tetrahedron (a triangular pyramid).
triangular prism or triangular pyramid
Triangular Prism
The solid shape that has one square face and four triangular faces is called a pyramid. If you were to have a shape that had four triangular faces and no square face, it would be called a triangular pyramid.
Those figures are called triangular prisms.
The regular solid, with 20 identical equilateral triangular faces, is called an icosahedron.
pyramid
They are called Toblerone Chocolates.
triangular pyramid
A solid figure with five faces is called a pyramid. Specifically, a triangular pyramid, or tetrahedron, has four triangular faces, while a square pyramid has one square base and four triangular faces, totaling five. The pyramid's faces meet at a single point called the apex.
Triangular based pyramid
A Triangular Pyramid
A triangular pyramid.