Who wrote the three words "Wahaha" as the trademark of Hangzhou Wahaha Group? is the meaning of the trademark symbol. The words, graphics or symbols marked with ? are trademarks, but they may not have been registered (unregistered ones are not protected by law). tm is the abbreviation of English trademark. It is the copyright mark used during the registration and review period of the trademark, while ? is the copyright mark that can only be used after the review period and approval! It means registered in English, which represents a registered trademark and is protected by trademark law.