A tetrahedron (triangular pyramid)
A rectangular pyramid,
A pentagonal pyramid,
A hexagonal pyramid,
A heptagonal pyramid,
An octagonal pyramid,
A nonagonal pyramid,
the list is endless.
Plus you can have prisms for each of the above.
Then there are the sphere, ellipsoid, cone.
Not forgetting irregular and concave shapes.
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NO!!! It is a seven(7) - sided 2-dimensional polygon. A Heptahedron is a seven(7) -sided 3-dimensional object.
A septagon or a heptagon
about 10
A hexagon is a 6 sided polygon and a heptagon is a 7 sided polygon.
You can have a 3d shape with any no of sides 3d only means there are three measure needed to calculate volume, or in other words you can pick it up and touch it. These three measurements are width, depth and height. If the faces all had to be of the same area and flat there might not be a 7 sided 3d shape (or a regular one at least) there can always be a n-sided non-irregular shape even a 1,253,703-sided irregular shape is theoretically possible.