Pavicon is a small images on the left side of your toolbar address in your browser.joomla default pavicon located in folder images with name favicon.ico
to remove pavicon.ico in your joomla sites, simply edit frontend.php files in includes folder under public HTML
Remove this lines :
?>
<link rel="shortcut icon" href="<?php echo $icon;?>" />
<?php
refresh your browser , and its done
