Trefoil knot

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In mathematics' branch of topology, the trefoil knot emerges as the most basic example of a nontrivial knot. By joining two loose ends of an overhand knot together, one obtains a knotted loop that is the trefoil. As the simplest knot known, the trefoil plays a foundational role in studying mathematical knot theory, which has widespread applications in topology, geometry, physics, chemistry and magic.