In 2 dimensions, a heptagon.
In 3 dimensions a hexagonal pyramid, a pentagonal dipyramid and some other exotic shapes - eg shape with one triangular base and one quadrilateral base and miscellaneous faces joining them.
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Heptagon
The shape that has no vertices and is round is a circle. The circle is the only shape that does not have vertices.
Heptagonal pyramid * * * * * No. A heptagonal pyramid has 8 vertices. You need a hexagonal pyramid or a pentagonal dipyramid for 7 vertices. Or, in 2d, a heptagon.
no shape equals to that
the vertices are the corners to the shape, so you count the corners to whatever shape.