TM is the abbreviation of English trademark, which means trademark. The law does not regulate the use of the TM mark. The use of the "TM" mark has no correspondence with whether the trademark has applied for registration, whether it has been accepted, whether it has received a preliminary approval announcement, whether it has been opposed, or whether it has been approved for registration. This is just a mark voluntarily used by the trademark owner, and it does not necessarily mean that the TM mark is a trademark. The significance of using the TM mark is that the user actively wants to tell others: This is my family's trademark.