WordPress at a glance
action is not described

delete_option action-hook . WP 2.9.0

Fires immediately before an option is deleted.

Usage

add_action( 'delete_option', 'action_function_name_6465' );
function action_function_name_6465( $option ){
	// action...
}
$option(string)
Name of the option to delete.

Where the hook is called

delete_option()
wp-includes/option.php 553
do_action( 'delete_option', $option );

Where the hook is used (in WP core)

Does not used.