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A cylinder
A cylinder is best described as congruent on parallel planes or discs.
A cylinder would fit the given description.
There are many possible answers. Some of them are: 1. A cylinder; 2. A sphere, ellipsoid, double cone, an isosceles double paraboloid intersected by two parallel planes that are equidistant from the centre of major axis and, except for the sphere, perpendicular to it; 3. A torus (doughnut) cut in half be a vertical plane.
If there are N discs, the minimum number of moves required is 2N - 1.