Trademarks are very common in foreign trademarks. It is the abbreviation of "trade mark" in English, which means "commercial mark" in Chinese, so "TM" means "trademark". Its function is to tell people that the graphic or text marked by it is a trademark of this commodity or service, not a name or advertisement, so as to prevent the graphic or text marked by it from flowing into the public domain and not applying for registration as a trademark. At the same time, marking "TM" can also be used as proof that the graphic or text is used as a trademark. When applying for registration of a trademark, it enjoys the prior right to use it.