The coordinate symbol is a visual reference to the drawing. It is located in the lower left corner of the graphics area. This symbol indicates the position of the axes of the coordinate system and provides orientation of the alignment of the current coordinate system.
In the illustration, the coordinate symbol on the left indicates a standard plan view of the drawing. The one on the right indicates that the view is 3D (isometric).
You can fade in and out the coordinate symbol with the CSIcon command.