<http://schema.org/description>
"Typically, Google doesn't enable AdWords advertisers to place certain HTML entities in their AdWords ads.  In the past, placing stars or other HTML entities that make an ad or listing stand out was no"^^<http://www.w3.org/2001/XMLSchema#string>
<https://www.seroundtable.com/adwords-sitelinks-stars-12720.html>