Soliton - Solenoid

Play of words part II, in mathematics and physics, a soliton is a self-reinforcing solitary wave (a wave packet or pulse) that maintains its shape while it travels at constant speed. If you see the trefoil knot as a particle structure trough wich this pulse propagtes ... A solenoid is a bunch of coils, if you look at the trefoil knot it is a structure made up out of 3 coils. If in a solenoid a current is generated, an electromagnetic field is generated, and there we have our Torus-current in a toroidal coil, generating a charge (+).

Toroidal coil with multiple loops, generating a current.

http://en.wikipedia.org/wiki/Toroidal_inductors_and_transformers