If you
pull one side
it will pull another part
The symbol in the middle of the ring is called Tibetan knot (Srivatsa or the
endless knot) and is one of the eight symbols of the Tibetan Buddhism.
The Tibetan knot can stand for karmic consequences: pull here, something happens over there.
It is an apt symbol for the Vajrayana methods: Often when we tug at one
part of a knot while trying to loosen it, another part gets tighter.
You have to work with the knot to get it to come undone.
The
Tibetan knot with its endless configuration evokes the cyclical nature
of rebirth and also calls karmic connections to mind.