A torinder is a four-dimensional shape produced by the product of a line segment and a solid torus; this means that it is a prism with a solid torus as the base. It is composed of two tori and a curved 3-D surface,
Structure and Sections[]
The torinder, embedded in 4-D, has three types of sections. One is an unchanging torus, one looks like a cylinder splitting in two cylinders before merging, and one is a line expanding to cylinder, splitting in two concentric cylinders, and shrinking back.