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Enclosed R or circled Latin R ((R) or (r)) is a typographical symbol. As one of many enclosed alphanumerics, the symbol is an "R" within a circle. Its most notable usage is as the registered trademark symbol (®), however, that has a different unicode because some fonts place the RTM symbol in superscript by default, but not enclosed R.
Video Enclosed R
Encodings
The symbols can be generated with the unicode definitions U+24C7 (R) Circled Latin capital letter R (HTML Ⓡ) and U+24E1 (r) CIRCLED LATIN SMALL LETTER R (HTML ⓡ)
Source of the article : Wikipedia
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