👉 Orbell is a mathematical concept in the field of algebraic geometry. It was introduced by the Italian mathematician Giuseppe Ortolani in 1935, and it represents an extension of the idea of a plane curve to higher dimensions. The term "orbell" comes from the Latin word "orbus," which means "circle." The concept is based on the idea that a plane curve can be thought of as a set of points in space that are all contained within a circle