HTML Codes - Table for easy reference of ascii characters and symbols in HTML format. Dec, Hex, Symbol, Number, Name . registered trade mark sign. The registered trademark symbol (®) is a symbol that provides notice that the preceding word It is mapped in Unicode as U+00AE ® Registered sign (HTML · ®). The registered trademark symbol ® is distinct, in computer. Reserved characters in HTML must be replaced with character entities. Characters that are You will see more HTML symbols in the next chapter of this tutorial.