function menu_icon( $icon = "dashicons-admin-page" ) {

        if ( is_string( $icon ) && stripos( $icon, "dashicons" ) !== false ) {

            $this->options["menu_icon"] = $icon;

        } else {

            // Set a default menu icon
            $this->options["menu_icon"] = "dashicons-admin-page";
        }
    }