It depends on the shape. The top of a pyramid will be a point (the apex). The top (and bottom) of a prism or an antiprism will be congruent polygons.
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Its a pentagonal prism.
It is sometimes called the base.
The shape is 3 dimensional, the top down view is 2 dimensional.
The net of a 2 dimensional shape can be folded into a 3 dimensional shape
A cube is a 3 dimensional shape