do_favicon WordPress Action Hook
The do_favicon Wordpress hook allows you to specify a custom favicon for your Wordpress site. This can be useful if you want to brand your site with a unique favicon, or if you simply don't like the default Wordpress favicon. You can use this hook by specifying the URL of your favicon in the $favicon parameter.
do_action( 'do_favicon' ) #
Fired when the template loader determines a favicon.ico request.