In knot theory, the 6<sub>3</sub> knot is one of three prime knots with crossing number six, the others being the stevedore knot and the 6<sub>2</sub> knot. It is alternating, hyperbolic, and fully amphichiral. It can be written as the braid word
Like the figure-eight knot, the 6<sub>3</sub> knot is fully amphichiral. This means that the 6<sub>3</sub> knot is amphichiral, meaning that it is indistinguishable from its own mirror image. In addition, it is also invertible, meaning that orienting the curve in either direction yields the same oriented knot.
The Alexander polynomial of the 6<sub>3</sub> knot is
and the Kauffman polynomial is
The 6<sub>3</sub> knot is a hyperbolic knot, with its complement having a volume of approximately 5.69302.