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The word you are looking for is icon.
It is a graphical indicator of some action that a user may want to do. They do the action by clicking on the icon.
An icon is the graphical representation of an application software. While, A folder is the composition of documents for the purpose of data storage.
menu button
A wrench icon appears on your cars dash when the engine needs attention.
graphical user interface
"Graphical" means pictures, so yes, most user interfaces are graphical now. When you click on an icon to open a file or program, that's a graphical interface. A text interface was the standard before graphical interfaces took the computer world by storm.
A graphical user interface (GUI) feature in which a small text box appears when a mouse pointer is hovered over an icon or button. The pop-up window will provide details that explain the icon's or button's function. In some instances, though, the ScreenTip will display only the item's name.
No, icons and other graphical symbols are part of the Graphical User Interface (GUI output) as are mice and touch devices (GUI input) that allows the user to interact with apps and the operating system.
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