The linetype name and definition determine the particular dash-dot sequence, the relative lengths of dashes and blank spaces, and the characteristics of any included text or shapes. You can use any of the standard linetypes that AutoCAD LT provides, or you can create your own linetypes.
examples of linetypes
Linetypes are defined in one or more linetype definition files that have an .lin file extension. An LIN file can contain definitions of many simple and complex linetypes. You can add new linetypes to an existing LIN file, or you can create your own LIN file. To create or modify linetype definitions, edit the LIN file using a text editor or word processor.
When you create a linetype, it is not loaded into your drawing automatically; you must first load the linetype.
The three LIN files included in AutoCAD LT are aclt.lin, acltiso.lin, and ltypeshp.lin. You can display or print these ASCII text files to better understand how to construct linetypes.
Creating Simple Linetypes
Including Text Characters in Linetypes (Advanced)