The `setWindowIcon` method in the `calibre.gui2.Application` class is used to set the icon (also known as the window icon or application icon) for the Calibre GUI application. This method allows the user to specify a custom icon to be displayed in the title bar and taskbar of the application window. The icon can be any image file in a supported format, such as PNG or ICO. By setting a custom window icon, the user can personalize the appearance of the Calibre application to better suit their preferences or branding needs.
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