Orphan Elements are elements that exist in the model, but are not included on a diagram for some reason. They can occur in the process of creating and editing diagrams and get left behind, sometimes due to being deleted off the diagram, but not subsequently the model.
Enterprise Architect has a pre-defined search that identifies any Orphan Elements, which can come in handy when cleaning up your model.
To search for Orphan Elements, open the Model Search using Crtl+Alt+A and from the Pull Down Menus > select Diagram Searches > then Find Orphans.
You can search for specific terms as well, for example name - this case "Oliver Twist."
If you would like a list of other pre-defined model searches take a look at our User Guide