WordPress at a glance
action is not described

unregistered_taxonomy action-hook . WP 4.5.0

Fires after a taxonomy is unregistered.

Usage

add_action( 'unregistered_taxonomy', 'action_function_name_7916' );
function action_function_name_7916( $taxonomy ){
	// action...
}
$taxonomy(string)
Taxonomy name.

Where the hook is called

unregister_taxonomy()
wp-includes/taxonomy.php 453
do_action( 'unregistered_taxonomy', $taxonomy );

Where the hook is used (in WP core)

Does not used.