WordPress at a glance
action is not described

registered_taxonomy action-hook . WP 3.3.0

Fires after a taxonomy is registered.

Usage

add_action( 'registered_taxonomy', 'action_function_name_8073', 10, 3 );
function action_function_name_8073( $taxonomy, $object_type, $args ){
	// action...
}
$taxonomy(string)
Taxonomy slug.
$object_type(array/string)
Object type or array of object types.
$args(array)
Array of taxonomy registration arguments.

Where the hook is called

register_taxonomy()
registered_taxonomy
wp-includes/taxonomy.php 410
do_action( 'registered_taxonomy', $taxonomy, $object_type, (array) $taxonomy_object );

Where the hook is used (in WP core)

Does not used.