It doesn’t need to be marked. R is used in trademarks to mean registered trademarks. The circle R indicates "registered trademark", which means that the trademark has been applied for registration at the National Trademark Office and has been reviewed and approved by the Trademark Office to become a registered trademark. The R trademark has the characteristics of exclusivity, exclusivity, and uniqueness. It is exclusively owned by the owner of the registered trademark and is protected by law. No enterprise or individual may use it without the permission or authorization of the owner of the registered trademark, otherwise it will bear infringement liability.