wp_meta WordPress Action Hook
The wp_meta hook is one of the most versatile hooks in WordPress. It can be used to add custom fields to any post type, including custom post types. It is also used to add custom fields to user profiles. Additionally, the wp_meta hook can be used to add custom fields to any taxonomy, including custom taxonomies.
do_action( 'wp_meta' ) #
Fires before displaying echoed content in the sidebar.