The registered sign is used to indicate that a word, string of words, symbol, or graphic is a registered trademark or service mark. Registered trademarks or service marks are provided some protected by the law the land. The intent is to keep other people and companies from infringing on the intellectual property of others.
To use Emoji "Registered Sign" in VK copy the Emoji-symbol or its HTML-code from the corresponding text field and paste it into comments, private messages, status and wall posts.