The use of TM means the trademark symbol, that is, the words, graphics or symbols marked with TM are trademarks, but they are not necessarily registered (unregistered ones are not protected by law). TM is the abbreviation of English trademark.

The circle R is the mark of "registered trademark", which means that the trademark has been applied for registration with the National Trademark Office and has been reviewed and approved by the Trademark Office to become a registered trademark. The R in the circle is the first letter of English register.