https://forums.autodesk.com/t5/autocad-2000-2000i-2002-archive/2d-polyline-vs-polyline/m-p/111135#M32067 Nothing. The difference comes between polyline and 3D polyline. A 3D<BR /> polyline may have a different elevation (z value) for each vertex; a plain<BR /> (2D) polyline or LWpolyline must all lie in the same plane.<BR /> ___<BR /> <BR /> "Jason Michel" <JMICHEL> wrote in message<BR /> news:3392FD24F223433D26BD9FC48E0BBAA8@in.WebX.maYIadrTaRb...<BR /> &gt; What is the difference between a "2D Polyline" and a "Polyline"?</JMICHEL> Mon, 14 Jul 2003 12:33:34 GMT Anonymous 2003-07-14T12:33:34Z