When I use my AutoCAD Map 3D or a product that has AutoCAD Map 3D (AutoCAD Civil 3D, AutoCAD Land Desktop) 2009 I have a weird symbol in my drawing and I can not erase it.
This is known as the Geomarker and shows if you have a coordinate system assigned to the drawing. This is a No Plot object but can be turned off by typing.
Set this to
now the marker is off
0 = Off
1 = On