The satellite knot of an unknot twisted inside a torus.
Whitehead Double
See also
Doubled Knot, Satellite Knot, Torus, UnknotExplore with Wolfram|Alpha
References
Adams, C. C. The Knot Book: An Elementary Introduction to the Mathematical Theory of Knots. New York: W. H. Freeman, pp. 115-116, 1994.Referenced on Wolfram|Alpha
Whitehead DoubleCite this as:
Weisstein, Eric W. "Whitehead Double." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/WhiteheadDouble.html