When you are prompted to enter points, vectors, distances, or angles, crosshairs indicate the current pointer position in the drawing.
As with the coordinate symbol, crosshairs also change when the drawing view changes from a standard plan view (viewed from above) to a 3D (isometric) view.
A box appears at the origin of the crosshairs when using EntitySnaps.
By clicking in the graphics area using the pointer, you can determine points, vectors, distances, and angles in a command.