TM is common in foreign trade marks. It is the abbreviation of English trade mark, which means "business mark" in Chinese, so TM means "trademark". Its function is to tell people that the graphics or words it marks are trademarks of this commodity or service, not names or advertising. And "R" is the abbreviation of English "register", which means "registration" in Chinese. When a commodity or service is marked with this mark, it tells people that the graphics or words it marks are not only trademarks, but also registered trademarks, which are protected by national laws and cannot be used by any other individuals or organizations without authorization.