WordPress at a glance
action is not described

login_form action-hook . WP 2.1.0

Fires following the 'Password' field in the login form.

Usage

add_action( 'login_form', 'action_function_name_1587' );
function action_function_name_1587(){
	// action...
}

Where the hook is called

In file: /wp-login.php
login_form
wp-login.php 1017
do_action( 'login_form' );

Where the hook is used (in WP core)

Does not used.