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Every core admin page has a corresponding 32px x 32px icon registered to it. This shortcode will display this icon in the location you place it in your themes admin_template.php.
Plugins are also able to register a 32px x 32px icon which will also be displayed by this shortcode when the user is on the plugins admin config page(s). If the plugin doesn't have this icon, then a generic plugins icon will be displayed instead.