This is what the problematic symbols look like.

To fix errenous symbols in the header and footer areas, place the following code in the .htaccess file.

<FilesMatch "\.(ttf|otf|eot)$">
<IfModule mod_headers.c>
Header set Access-Control-Allow-Origin "*"
</IfModule>
</FilesMatch>

The .htaccess file is a hidden system file that sits at the root of your Website directory. You can access it with cPanel File Manager and click on Settings to show hidden files. Then you edit it in the usual way, it is just an ascii file like a PHP, HTM, CSS and TXT files.