WordPress at a glance
action is not described

rss2_head action-hook . WP 2.0.0

Fires at the end of the RSS2 Feed Header.

Usage

add_action( 'rss2_head', 'action_function_name_4518' );
function action_function_name_4518(){
	// action...
}

Where the hook is called

In file: /wp-includes/feed-rss2.php
rss2_head
wp-includes/feed-rss2.php 82
do_action( 'rss2_head');
wp-admin/includes/export.php 481
do_action( 'rss2_head' );

Where the hook is used (in WP core)

wp-includes/default-filters.php 313
add_action( 'rss2_head', 'rss2_site_icon' );
wp-includes/default-filters.php 308
add_action( $action, 'the_generator' );