Adding an R to the circle in the upper right corner of the name or icon on a trademark means adding an R to the circle in the upper right corner of the name or icon on a trademark to tell the public that the trademark is a registered trademark in this form, which is stipulated in the Regulations for the Implementation of the Trademark Law.

Article 63 of the Regulations for the Implementation of the Trademark Law

Where a registered trademark is used, a "registered trademark" or a registration mark may be marked on the commodity and its packaging, instructions or other accessories.

Registration marks include (○ note in) and (○ plus R). The use of a registered trademark shall be marked in the upper right corner or the lower right corner of the trademark.