Triskaidecagon or Tridecagon
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A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
A 'hedron' from Latin. Hence 'polyhedron' a many sided three dimensional object.
Triskaidecahedron
There are many options. Some of these are: A pyramid with a base that is a 19 sided polygon; A dipyramid with a "centre" that is an 18 sided polygon; A prism with decagonal bases.
a 4 sided 3d shape is called a triangular prism!!!!!!!!!!!!!!!