Suppress the display of objects—partly or entirely—that are located behind other objects in three-dimensional views.
You can create a hidden-line representation of the objects displayed in the current viewport. Hidden-line representations suppress lines, edges, and other objects—partly or entirely—that are located behind the following types of objects:
The illustration below was created with lines that were extruded by giving them a nonzero thickness.
Objects on layers that are turned off but not frozen can also hide other objects.
For viewing, you can temporarily suppress hidden lines with HIDE.
HIDE suppresses all hidden lines in a view. When the view is regenerated, all objects are displayed normally.