It allows the user to create a solid torus which has the information of two radii and the angle. By defining two points to set the major radius and the minor radius on the working window, the user can make it easily. For references, when selecting two points, the major radius is calculated automatically, and the minor radius should be defined as 25% of the major radius. At this time, the angle is 360 degree as default.
Figure 1 Torus icon of the Marker and Geometry in the Geometry tab [Body Edit Mode]