Also the Error Ellipsoid. When 3D Points are solved in the processing algorithm, a precision is estimated for them. See Precision. The precision is known in three dimensions. In the table these are shown as precision along axes and in the 3D Viewer they are shown as an ellipsoid. Use the 3D Viewer Options to turn on Confidence Region display. Technically these ellipsoids are iso-surfaces of constant probability error. Every point on the ellipsoid is a constant one sigma probability of point position.
These ellipsoids are useful when you look at a) their shape, or b) their relative size to other point ellipsoids. If an ellipsoid is a sphere then the point’s position is equally likely in all directions. If it is a strong oval shape then the point is less accurate in one direction (i.e. the longest dimension of the ellipsoid is the axis of most probable error of point). This is useful to see if for example that direction is very important for your measurement task. The relative size of the ellipsoids gives a very quick visual way to see if some points are more accurate (or inaccurate). The larger the ellipsoid the greater probability that point is inaccurate.
See also Confidence Regions in the 3D Viewer.