See also:

U+24C5, Ⓟ
CIRCLED LATIN CAPITAL LETTER P

[U+24C4]
Enclosed Alphanumerics
[U+24C6]
Daltonian symbol for platinum

Translingual

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Symbol

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  1. (electricity) water pumper
  2. (chemistry, obsolete) platinum ("platina", Daltonian symbol)
    Technically, this should be typeset as a black 'P' in a red circle.
  3. (phonetics) an unidentifiable/indeterminate plosive
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See and ◌⃝ for uses of a letter inside a circle.