© U+00A9 marks copyright; ℗ U+2117 is the equivalent for sound recordings. ™ U+2122 marks a trademark and ℠ U+2120 a service mark, whether registered or not, while ® U+00AE is conventionally reserved for marks that are officially registered.
Beware of lookalikes: Ⓒ U+24B8 and ⓒ U+24D2 are circled letters, not copyright signs, and screen readers announce them as letters. § and ¶ are used to cite sections and paragraphs of laws and contracts; § is doubled (§§) for a range of sections.
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