Circle with an R in the middle. The R stands for registered. The labeling may only be used for registered trademarks. Trademark law thus protects goods or services from imitators.
The registered emoji was introduced in 1995 and released as part of the Unicode 11.0 standard. This emoji can be found under the symbols
category. Because the registered emoji has been around for quite some time, it should display correctly in the majority of operating systems.