Trefoil knot
Simplest non-trivial closed knot with three crossings / From Wikipedia, the free encyclopedia
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This article is about the topological concept. For the protein fold, see trefoil knot fold.
In knot theory, a branch of mathematics, the trefoil knot is the simplest example of a nontrivial knot. The trefoil can be obtained by joining the two loose ends of a common overhand knot, resulting in a knotted loop. As the simplest knot, the trefoil is fundamental to the study of mathematical knot theory.
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The trefoil knot is named after the three-leaf clover (or trefoil) plant.