Polyline (Pline)
This command is almost the same function with the Line.
Polyline is a line single unit that can set its thickness at the beginning - or end.
The line drawn by Pline command, although the number a lot but is one unit (entity).
Meanwhile, when used in the command line, although many lines are drawn in sequence is a broken line / is not a single entity.
In this example by using the command PLINE.