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The Link of 2-spheres in 
obtained by Spinning intertwined arcs. The link consists of a knotted
2-sphere and a Spun Trefoil Knot.
See also Spun Knot, Trefoil Knot
References
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, p. 94, 1976.