In topology, a branch of mathematics, the trefoil knot is the
simplest example of a nontrivial knot. The trefoil can be obtained by
joining together 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, which has
diverse applications in topology, geometry, physics, and chemistry.
The trefoil knot is named after the three-leaf clover (or trefoil)
plant.
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