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This is the symbol that I do not know what it means. The top trace leads to a polarized capacitor

top trace leads to a polarized capacitor

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    \$\begingroup\$ Surely the complete circuit gives a clue that it's a microphone or at least an audio or vibration transducer? \$\endgroup\$
    – Transistor
    Commented Mar 14, 2022 at 12:30

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It's the symbol for an electret microphone.

Here are the external and internal schematics.

enter image description here enter image description here

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