Atoroidal

The term "atoroidal" generally refers to a shape or object that is not toroidal or donut-shaped. In a toroidal structure, there is a central void around which the material is distributed in a circular manner, resembling a donut. By contrast, an "atoroidal" shape would lack this characteristic of having a central void or hole, meaning it could refer to various forms such as spherical, cylindrical, or other geometrical shapes that do not incorporate the toroidal geometry.