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Sound recording copyright symbol - Wikipedia
Alt Codes for Circled Numbers & Letters (① Ⓐ )
Alt Code Shortcuts for Encircled Letters - WebNots
Copyright symbols (C) ©, (P) ℗ (easy copy-paste)
Copyright symbols and their use :: Copyright Witness
Inserting a Circled P Copyright Symbol in Text
Sound Recording Copyright ℗ symbol in Word, Excel, PowerPoint …
What those various packaging symbols mean: On My Mind Blog
Category:Encircled single letter: P - Wikimedia Commons
Letter P Circle royalty-free images - Shutterstock