"TM" is a trademark symbol. In China, TM on a trademark also has its special meaning. In fact, TM does not protect the trademark. It is different from R. TM means that the trademark has been applied to the State Trademark Office, and the State Trademark Office has issued a Notice of Acceptance, which has entered an objection period. This can prevent others from filing repeated applications, and also means that existing trademark holders have priority to use it. The circle R is the mark of "registered trademark", which means that the trademark has been registered in the State Trademark Office and has been examined and approved by the Trademark Office, and has become a registered trademark. R in the circle is the initial letter of English register registration. A registered trademark has the characteristics of exclusiveness, exclusiveness and uniqueness. It belongs to the owner of the registered trademark and is protected by law. No enterprise or individual may use it without the permission or authorization of the owner of the registered trademark, otherwise it will bear the tort liability. Using TM means trademark symbol, that is, the words, graphics or symbols marked with TM are trademarks, but they are not necessarily registered (unregistered ones are not protected by law). TM is the abbreviation of English trademark.

a standard of "TF" memory card, TF is a small card and SD is a large card, both of which are flash cards. TF card has the smallest size and can be used as SD card after SD card converter. Adapters can be used on devices that use SD as storage media. TransFlash is mainly developed for camera phones to shoot large images and download large video clips. TransFlash card can be used to store personal data, such as digital photos, MP3, games, applications for mobile phones and personal data, etc., and a copyright protection management system is also built in to protect downloaded music, videos and games. In the future, the new TransFlash is also equipped with encryption function to protect personal data, financial records and health care documents. The compact TransFlash allows manufacturers to adopt this design without worrying about the size of the phone, and another flexible application is that suppliers can replace it according to the different needs of customers at any time before delivery, which is an advantage that embedded flash memory does not have.