Does the font matter for the ® registered trademark symbol?
~ Evansville, IN
The purpose of the ® (registered trademark symbol) is to provide notice. If the symbol cannot be read, then it is not providing notice. Select a font that allows the registered trademark symbol to be readable and legible. Most fonts include the registered trademark symbol, so you should not need to change fonts to use the ® symbol.
Ultimately, have your attorney review your product packaging, services advertisements, or other uses of your trademark to be sure that you are using your trademark and marking your goods & services properly.