The revision cloud tool

Revision cloud is a markup tool that is not generally used to make things in AutoCAD; rather it is used to show areas in a drawing that are subjected to further inspection or to draw attention to some parts of the drawing.

The revision cloud tool is also in the expanded Draw panel in the Home tab, as shown:

As you can see, there are three different ways of making a revision cloud in AutoCAD: Rectangular, Polygonal, and Freehand.