IOS:Outlet
An outlet is a property that is annotated with the symbol IBOutlet and whose value you can set graphically in a nib file or a storyboard. You declare an outlet in the interface of a class, and you make a connection between the outlet and another object in the nib file or storyboard. When the file is loaded, the connection is established.
You define an outlet as a property with the type qualifier of IBOutlet.