SM refers to the service mark.

TM refers to a trademark that has been applied to the National Trademark Office but has not yet been successfully registered.

R means that the trademark has been applied for registration at the National Trademark Office and has been reviewed and approved by the Trademark Office, and the trademark registration is successful. Registered trademarks have the characteristics of exclusivity, exclusivity, and uniqueness. They are exclusively owned by the owner of the registered trademark and are protected by law. No enterprise or individual may use it without the permission or authorization of the owner of the registered trademark, otherwise they will bear infringement liability.