  We present an exact solution to the stationary coupled nonlinear
Gross-Pitaevskii equations which govern the motion of the spinor Bose-Einstein
condensates. The solitonic solution is a twisted half-skyrmion in the
three-dimension (3D) space. By making a map from and the Cartesian coordinates
to the toroidal coordinates, we demonstrate it is a linked half-unknot with a
fractional Hopf charge.
