U+24C8, Ⓢ
CIRCLED LATIN CAPITAL LETTER S

[U+24C7]
Enclosed Alphanumerics
[U+24C9]

Translingual

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Symbol

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  1. (electricity) smoke detector
  2. (phonetics) an unidentifiable/indeterminate sibilant
  3. (chemistry, obsolete) silver (Daltonian symbol)
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See for uses of a letter inside a circle.