WordPress at a glance
action is not described

admin_print_styles-(hook_suffix) action-hook . WP 2.6.0

Fires when styles are printed for a specific admin page based on $hook_suffix.

Usage

add_action( 'admin_print_styles-(hook_suffix)', 'action_function_name_6461' );
function action_function_name_6461(){
	// action...
}

Where the hook is called

In file: /wp-admin/admin-header.php
admin_print_styles-(hook_suffix)
wp-admin/admin-header.php 104
do_action( "admin_print_styles-{$hook_suffix}" );
wp-admin/includes/template.php 1799
do_action( "admin_print_styles-$hook_suffix" );

Where the hook is used (in WP core)

wp-admin/custom-header.php 79
add_action( "admin_print_styles-$page", array( $this, 'css_includes' ) );