The link of 2-spheres in 
obtained by spinning intertwined
arcs. The link consists of a knotted 2-sphere and a spun trefoil knot.
Andrews-Curtis Link
See also
Spun Knot, Trefoil KnotExplore with Wolfram|Alpha
References
Rolfsen, D. Knots and Links. Wilmington, DE: Publish or Perish Press, pp. 94 and 142-143, 1976.Referenced on Wolfram|Alpha
Andrews-Curtis LinkCite this as:
Weisstein, Eric W. "Andrews-Curtis Link." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Andrews-CurtisLink.html