noun

• A placeholder name for an unnamed, unspecified, or hypothetical manufactured good or product, typically as an example for purposes of explaining concepts.
• A floating device inside a beer can, meant to create foam when opened.
• A small scraping tool consisting of a blade and a handle, commonly used to remove paint from glass and other smooth surfaces.
• (informal) Synonym of tool, implement, device, gadget, part
• (graphical user interface) Any one of the components of a computer application's graphical user interface, such as a Cancel button or text input box that a user interacts with.
• (graphical user interface) A small applet that can be placed on the desktop or in a sidebar, etc.