The ™ and Ⓡ symbols are not synonymous. They do not refer to the same thing. The Ⓡ symbol can be used only with actual registered names, logos and slogans in order to reflect you actually OWN your rights. ™ on other hand, can be used for any products and services, even when they are not registered trademarks yet. After you have filed the application and until the trademark is registered, this is the symbol you want to use.
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