The trademark registration symbol is commonly referred to a the “circle-R.”   ®

 There are actually a lot of registered trademarks that feature R in a circle. Some of them are no doubt intentional references to the registered trademark symbols. Others are probably just logos for businesses that start with an “R.”  The logos represent all kinds of products and services.

Here are some of the interesting registered “circle R” trademarks (click image for USPTO records):









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