A tetrahedron has four vertexes and four faces and six edges.
Triangular Pyramid
It can be a pyramid shape with an equilateral triangle base
That could be a triangular pyramid.
equilateral triangle
The tetrahedron has 4 equilateral triangles as its faces.
Yield signs are triangular, but have rounded corners. An actual triangular shape, if equilateral, would be a regular polygon.
Triangular Pyramid
It can be a pyramid shape with an equilateral triangle base
That could be a triangular pyramid.
equilateral triangle
A triangular based pyramid.
The tetrahedron has 4 equilateral triangles as its faces.
A square, a cube, a diamond, a equilateral triangle, a triangular based pyramid made of equilateral triangles...
May be a pyramid.
tetrahedron aka triangular pyramid
A triangular prism does!
A tetrahedron (a pyramid with a triangular base).