Definition of CAD's

Can somebody please tell me what defines a CAD as a CAD, e.g.
Is the shotgun blank in a mortar charge a CAD?
Is a flare ctge a CAD?
A local gunsmith -Status Guns- makes blanks to propel weights with a net attached, to be fired from a helicopter in the recovery of live deer. Is that a CAD?

I might suggest you take advantage of the