This is the original Hapkido Symbol. The circle signifies the universe, inside the universe is man.
The angles intersecting the circle on both sides represent man’s thumb and finger, indicating his action in his world,
his ability to attack and defend, to be soft or hard.
The intersecting angles also represent Ki (power, energy) and Uom & Yeang (opposites),
they show that changes are constant in our world and that the balance between opposites produces harmony.