It should be tm
TM is the abbreviation of TRADEMARK. American trademarks are usually added with TM, which does not necessarily refer to a registered trademark.
Generally, after a trademark acceptance notice is issued, you need to mark TM. In the upper right corner or lower right corner of the trademark, TM does not mean that the trademark application will be successful, it only means that the trademark is being applied for. It is not easy to answer the questions. If you feel I am satisfied and hope to adopt it. If you don’t understand, you can go to the Yipin Trademark Bureau. They are a service platform specializing in registering trademarks and designing trademarks. I believe they can help you.