Cloud (Cld) lisp command is used to create the shape similar to cloud with the help of pick points and defined radius. This is very useful for good representation of the drawing. Cloud list will just create the arcs depending on the points selected and defined arc radius. This can also be done with Pedit command arc option, but that process will have more steps in comparison to working with Cloud lisp. Also, since arc is created on the basis of defined radius, the output will look more pleasing.
Lisp comes handy for improving drawing presentation. For more lisp programs which help better presentation of drawing in short time, you may also refer