WordPress at a glance
action is not described

login_head action-hook . WP 2.1.0

Fires in the login page header after scripts are enqueued.

Usage

add_action( 'login_head', 'action_function_name_9775' );
function action_function_name_9775(){
	// action...
}

Where the hook is called

login_header()
wp-login.php 111
do_action( 'login_head' );

Where the hook is used (in WP core)

wp-includes/default-filters.php 299
add_filter( 'login_head', 'wp_resource_hints', 8 );
wp-includes/default-filters.php 300
add_action( 'login_head', 'wp_print_head_scripts', 9 );
wp-includes/default-filters.php 301
add_action( 'login_head', 'print_admin_styles', 9 );
wp-includes/default-filters.php 302
add_action( 'login_head', 'wp_site_icon', 99 );
wp-login.php 37
add_action( 'login_head', 'wp_sensitive_page_meta' );
wp-login.php 39
add_action( 'login_head', 'wp_login_viewport_meta' );
wp-login.php 57
add_action( 'login_head', 'wp_shake_js', 12 );