The term Hula Hoop, for one, can be summarized as a torus, which is a three-dimensional object with a circular cross-section. It is a closed surface formed by revolving a circle around an axis that does not intersect the circle. The hula hoop is a popular toy consisting of a torus-shaped hoop that is spun around the waist, limbs or neck. It is believed to have originated in ancient Greece and has been used for centuries as a form of exercise and entertainment.