The symbol that means 'registered' is a ®.
Registered Nurse....
The symbol capital R within a circle [®], or circled capital letter R, is the registered trademark symbol. This indicates that the product is registered with a national trademark office (ex: Registered, U.S. Patent and Trademark Office). If a trademark is not officially registered, then it will be marked with a superscript TM (in capitals).
Symbol for "registered trademark"
The registered trademark symbol, an R in a circle, indicates the preceding logo, slogan, etc. has been formally registered; the trademark symbol, a superscript TM, indicates the mark has not been formally registered.
You can put a trademark symbol on your product before it is registered. However, it isn't backed by anything official and it could be copied or imitated.
The ® symbol can be used after a business name that has been registered as a trademark.
Facebook is a registered trademark, which earns it the right to use the ® symbol.
The law doesn't specify.
No, that symbol indicates a registered trade mark.
No. Actually, the superscript TM is for designating trademarks in the US that have not yet been registered with the USPTO. If/when you get the trademark registered with the USPTO, you would use the ® instead.
It's not required to use the trademark or registered trademark symbols, and some designers feel it clutters the look of the packaging.
Typing (r) should autocorrect to the registered trademark symbol.