Install an icon to identify your application.
When listing an icon in a desktop file, the image must be installed in a standard location, given by the freedesktop.org Icon Theme and Icon Naming specifications. As a minimum, an application should install a 48×48 pixel icon into $prefix/share/icons/hicolor/48x48/apps in PNG format.
To match with other icons, both in GNOME and other platforms, follow the Tango Icon Theme guidelines when creating icons and application artwork.
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