On a coca cola can,what is inside the circle next to the name?Is it T,TM or R? what does it mean?

Question

On a coca cola can,what is inside the circle next to the name?Is it T,TM or R? what does it mean?

Answer 1

That the stylized script of the words "coca cola" are registered trade marks and cannot be copied or used without permission.  

Answer 2

it is an R meaning that the "dynamic ribbon device" (the language used in the patent to describe the stylized coca-cola) is a registered trademark.

Answer 3

It's an R which stands for registered trademark.

A registered trademark is "A mark filed in the United States Patent and Trademark Office, with a precise description of the mark, including drawing or photograph if appropriate; a registered trademark confers upon its owner the sole right of use, with protection against infringements or use by others."