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What does a circle R behind a trademark mean? What does a TM in some books mean?

The circle R indicates a registered trademark, which is the first letter from the English registered trademark.

Circle C means copyright, which comes from the initials of English copy right.

TM is equal to the first letter of the two words trade mark in English, which is a trademark. It may or may not be registered. The circle R can only be used on registered trademarks.