Registered trademark symbol
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The registered trademark symbol, ®, is a typographic symbol that provides notice that the preceding word or symbol is a trademark or service mark that has been registered with a national trademark office. Wikipedia
Different from: U+24C7 Ⓡ CIRCLED LATIN CAPITAL LETTER R
In Unicode: U+00AE ® REGISTERED SIGN (®, ®, ®)
See also: U+2122 ™ TRADE MARK SIGN; U+2120 ℠ SERVICE MARK