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admin_head is an action event and can be hooked by add_action hook.
Usage Example:
<?php
function my_custom_admin_head(){
echo '<style>[for="wp_welcome_panel-hide"] {display: none !important;}</style>';
}
add_action('admin_head', 'my_custom_admin_head');
?>
In this example I have added a style to admin_head so I can remove welcome message option from dashboard, you can make and customize your own function and add it the same way.
