I think a circle
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An octagon.
A cube
In the common use of the phrase "geometric solid", the answer is three. In advanced mathematics, dimensions greater than three are also studied. In many cases, the name of a plane (two-dimensional) figure has the ending "-gon" as in "hexagon", while the name of a solid figure (three dimensional) has the ending "-hedron" as in tetrahedron.
Its the name for a shape
The name of an eleven sided geometric shape is a Hendecagon or endecagon.