TM and R are known as Trademark and Registered. When you say Trademark, this means that a word or the logo of the product that you are creating is intended for an available product or service. There is still a possibility that the product or the logo may still be used for other things because this is not registered for a particular company just yet.
When you say registered which is symbolized by R, this means that the logo or the product is already registered under a certain company which means that it cannot be used by other companies anymore. When you place R, this means that it is already registered in the country where you have placed it in.
TM is an acronym for Trademark while R is an acronym for Registered. TM is used by a person, or business entity to show that a word, phrase or logo. It often belongs to a particular person and serves as an identifier to a product. Examples: “Just do it” is a phrase used by Nike.
The R symbol is used to indicate that this particular word, logo, and phrase is a registered trademark for a product or service. The major difference between TM and R is that the TM symbol does not necessarily mean that a trademark has been registered while the R symbol shows that the trademark has been registered. It is unlawful to use the trademark symbol unregistered.