How do you call a 3d convex shape made of 8 arbitrary points?

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Is there a name for a 3d convex shape made of 8 arbitrary points ?
That would be like a cube or a box, except that the distances would not necessarily be equals, neither the angles necessarily be right angles.
In 2D, the equivalent would be a convex quadrilateral, but how do we translate this concept in 3D ?