In knot theory, the three-twist knot is the twist knot with three-half twists. It is listed as the 52 knot in the Alexander-Briggs notation, and is one of two knots with crossing number five, the other being the cinquefoil knot.
The three-twist knot is a prime knot, and it is invertible but not amphichiral. Its Alexander polynomial is
its Conway polynomial is
and its Jones polynomial is
Because the Alexander polynomial is not monic, the three-twist knot is not fibered.
The three-twist knot is a hyperbolic knot, with its complement having a volume of approximately 2.82812.