A superscript capital R inside a circle (®), used only for marks formally registered with a national trademark office.
Also known as: R in a circle
The ® symbol indicates a trademark has been formally registered with the relevant national or regional trademark office (such as the USPTO). Using it for an unregistered mark is misleading, and in some jurisdictions unlawful.
Indicates the mark has been formally registered with a national or regional trademark office; legal use is generally restricted to marks that are actually registered.
Registration requirements and enforcement vary by jurisdiction.
The letter R fully enclosed within a circle, usually placed in superscript.
Frequently confused; see the comparison page for the legal distinction.
Both belong to the Intellectual property marks system.