It can be the top of a lamp or the top of a candle.
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Heptagonal Prism
A cuboid or a pyramid with a heptagonal base are two possibilities.
A heptagonal prism gas 21 edges.
There are many possible shapes. For example, a heptagonal pyramid, a hexagonal prism, a rectangular dipyramid.
Heptagonal is an adjective, not a noun! The answer will depend on whether you mean a heptagonal pyramid, a heptagonal bipyramid, a heptagonal prism or whatever.