A Control Class is a stereotype of a class that is specified in UML Extensions for Business Modeling. It can be shown as a regular class rectangle with stereotype of "control", or as this icon:

A control class is a class that contains an object which denotes an entity that controls interactions between a collection of objects. A control class usually has behavior specific for one Use case and a control object usually does not outlive the Use Case realizations in which it participates.

To draw a control class, select the Control icon from the tools menu.

See also Changing from icon view to class view.