There are infinitely many possible answers. Spheres, cuboids, blobs, ovoids are some examples.
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a rectangle in 3D A brick shape.
By definition a sphere is 3D. If it were only 2D it would be a circle.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
No 3D shape has only three sides to be a complete unit. If a 3D shape has a side which is curved, it has more than three sides, because any curve on a 3D object is an infinite number of sides. Think of it like if you had a million sided 2D object. From a distance, it would look like a circle, but mathematically, you can't have a perfect circle.
A cylinders