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A semicircle is one shape fitting this description.
It could be a cylinder
The mathematical name is a sector.
Cylindrical shape or Cylinder shape
At least one of the sides must be curved for a two sided shape. If the curved shape is part of a circle you will have shapes like a segment of a circle, a crescent or a convex lens. The types of shapes can be increased greatly if the curved side can be elliptic, or even better, just a wobbly line.