Trefoil knot

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 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.

Common nameOverhand knot
Arf invariant1
Braid length3
Braid no.2
Bridge no.2
Crosscap no.1
Crossing no.3
Hyperbolic volume0
Stick no.6
Tunnel no.1
Unknotting no.1
Conway notation[3]
A–B notation31
Dowker notation4, 6, 2
Last /Next01 / 41
alternating, torus, fibered, pretzel, prime, not slice, reversible, tricolorable, twist

The trefoil knot is named after the three-leaf clover (or trefoil) plant.

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