I am not a specialist of dompdf, but having used fpdf, I think it's something you do in your print template or custom module that converts the fields in dompdf format.
You may need to set a php rule like this:
$title = mb_convert_encoding($title, 'HTML-ENTITIES', 'UTF-8');
Or another one like this:
$titlePrintFriendly = preg_replace('#&#',chr(38),$title);
and then print
I used the second one in the past to trick printing some special chars.
The dompdf library should be loaded in the file you add this line.
I took the char number from https://github.com/dompdf/dompdf/blob/master/lib/fonts/Symbol.afm