R is the abbreviation of REGISTER, which means registered trademark when used in trademark. The circle R is a sign of a registered trademark, which indicates that the trademark has applied for registration in the State Trademark Office and has been approved by the Trademark Office to become a registered trademark. R trademark has the characteristics of exclusiveness, exclusiveness and uniqueness, belongs to the owner of registered trademark and is protected by law. Without the permission or authorization of the registered trademark owner, no enterprise or individual may use it, otherwise it will bear tort liability.