In geometry, a jack is a 3D cross shape consisting of three orthogonal ellipsoids.[1] Sometimes four small spheres are added to the ends of two ellipsoids, to more closely resemble a playing piece from the game of jacks.[2][3] Sometimes any 3D cross shape, consisting of cylinders, boxes or lines instead of ellipsoids, are also included.[4][5][6]
Original source: https://en.wikipedia.org/wiki/Jack (geometry).
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