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The copyright symbol, or copyright sign, designated by (a circled capital letter "C"), is the symbol used in copyright notices for works other than sound recordings.
The sound recording copyright symbol or phonogram symbol, ℗ (letter P in a circle), is the copyright symbol used to provide notice of copyright in a sound recording (phonogram) embodied in a phonorecord (LPs, audiotapes, cassette tapes, compact discs, etc.). [1]
In HTML and XML, a numeric character reference refers to a character by its Universal Character Set/Unicode code point, and uses the format: &#xhhhh;. or &#nnnn; where the x must be lowercase in XML documents, hhhh is the code point in hexadecimal form, and nnnn is the code point in decimal form.
The proper copyright notice for sound recordings of musical or other audio works is a sound recording copyright symbol (℗, the letter P inside a circle, Unicode U+2117 ℗ SOUND RECORDING COPYRIGHT), which indicates a sound recording copyright, with the letter P indicating a "phonorecord".
A numeric character reference refers to a character by its Universal Character Set/Unicode code point, and a character entity reference refers to a character by a predefined name. A numeric character reference uses the format &#nnnn; or &#xhhhh; where nnnn is the code point in decimal form, and hhhh is the code point in hexadecimal form.
The symbol is encoded in Unicode as U+1F16E CIRCLED C WITH OVERLAID BACKSLASH, [3] which was added in Unicode 13.0 in March 2020. [4] As there is no single definition of public domain and copyright laws differ by jurisdiction, a work can be in the public domain in some countries while still being under copyright in others (so called hybrid status).
According to US copyright law the copyright notice must be affixed and positioned to give "reasonable notice of the claim of copyright". [12] There are slightly different technical requirements for copyright notice on phonographic recordings, specifically using a sound recording copyright symbol ("℗") instead of the "©" symbol. [13]
The copyleft symbol is a mirrored version of the copyright symbol, ©: a reversed C in a circle. [60] A 2016 proposal to add the symbol to a future version of Unicode was accepted by the Unicode Technical Committee .