WordPress at a glance
action is not described

delete_term_taxonomy action-hook . WP 2.9.0

Fires immediately before a term taxonomy ID is deleted.

Usage

add_action( 'delete_term_taxonomy', 'action_function_name_4894' );
function action_function_name_4894( $tt_id ){
	// action...
}
$tt_id(int)
Term taxonomy ID.

Where the hook is called

wp_delete_term()
wp-includes/taxonomy.php 1776
do_action( 'delete_term_taxonomy', $tt_id );

Where the hook is used (in WP core)

Does not used.