WP_Query::is_favicon()
Is the query for the favicon.ico file?
Return
(bool) Whether the query is for the favicon.ico file.
Source
File: wp-includes/class-wp-query.php
public function is_favicon() {
		return (bool) $this->is_favicon;
	}  Changelog
| Version | Description | 
|---|---|
| 5.4.0 | Introduced. | 
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Licensed under the GNU GPLv2+ License.
    https://developer.wordpress.org/reference/classes/wp_query/is_favicon