I've asked a lot of questions about disks (example 1, example 2, example 3). There is no tag for disk, so I just choose the circle tag. But the circle tag's description is fairly clear about the scope of this tag: "For questions concerning circles. A circle is the locus of points in a plane that are at a fixed distance from a fixed point".
Should the circle tag's description be modified to include disks?
Update: The circle tag's description has been modified to include disks: "For elementary questions concerning circles (or disks)".