Index, which is associated with its referent (smoke is a sign of fire). This category includes stylized drawings of objects from the office environment or from other professional areas such as printers, scissors, file cabinets and folders. Icon, which resembles its referent (such as a road sign for falling rocks). The computing definition of 'icon' can include three distinct semiotical elements: Icons as parts of the graphical user interface of the computer system, in conjunction with windows, menus and a pointing device (mouse), belong to the much larger topic of the history of the graphical user interface that has largely supplanted the text-based interface for casual use. In activating an icon, the user can move directly into and out of the identified function without knowing anything further about the location or requirements of the file or code. Their placement on the screen, also in relation to other icons, may provide further information to the user about their usage. The user can activate an icon using a mouse, pointer, finger, or voice commands. It can serve as an electronic hyperlink or file shortcut to access the program or data. The icon itself is a quickly comprehensible symbol of a software tool, function, or a data file, accessible on the system and is more like a traffic sign than a detailed illustration of the actual entity it represents. In computing, an icon is a pictogram or ideogram displayed on a computer screen in order to help the user navigate a computer system. Desktop icons for file/data transfer, clock/awaiting, and running a program.

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