When a forum is deleted it is not immediately removed from the database but rather moved to a trash bin of sorts. It is done to allow the administrator to restore the accidentally removed forums, since once they are truly removed there is no going back.

This control panel allows the administrator to see all the forums inside the 'trash bin' and allows the administrator to either restore the forum, by choosing a category where to restore the forum by clicking on the 'Reassign' button or to truly delete the forum by clicking on the delete link.