doodad, doohickey, doojigger, gimmick, gizmo, gismo, gubbins, thingamabob, thingumabob, thingmabob, thingamajig, thingumajig, thingmajig, thingummy, whatchamacallit, whatchamacallum, whatsis, widget (noun)

something unspecified whose name is either forgotten or not known

"she eased the ball-shaped doodad back into its socket"; "there may be some great new gizmo around the corner that you will want to use"

appliance, contraption, contrivance, convenience, gadget, gizmo, gismo, widget (noun)

a device or control that is very useful for a particular job

Widget

A widget is an element of interaction in a graphical user interface (GUI), such as a button or a scroll bar. Controls are software components that a computer user interacts with through direct manipulation to read or edit information about an application. User interface libraries, such as e.g. GTK+ or Cocoa, contain a collection of widgets and the logic to render these. Each widget facilitates a specific type of user-computer interaction, and appears as a visible part of the application's GUI as defined by the theme and rendered by the rendering engine. The theme makes all widgets adhere to a unified aesthetic design and creates a sense of overall cohesion. Some widgets support interaction with the user, for example labels, buttons, and check boxes. Others act as containers that group the widgets added to them, for example windows, panels, and tabs. Structuring a user interface with widget toolkits allow developers to reuse code for similar tasks, and provides users with a common language for interaction, maintaining consistency throughout the whole information system. Graphical user interface builders, such as e.g.