A triangular pyramid
A triangular pyramid has four sides - each of which is a triangle.
There cannot be a three sided pyramid.
If you mean a 3 sided Pyramid with its base being the forth side it would be a Quadrangle.
A four-sided triangular solid is also called a tetrahedron, and two interlaced are called a Star Tetrahedron.
Chat with our AI personalities
Smooth [sided] pyramid Step [sided] pyramid Bent pyramid
(3) Quartz
A tall four sides structure with a pyramid on the top was called
Smooth sided style.
Japan sided with Germany and Italy. These three joined forces to make up what was called the Axis.