Electronic – Unknown symbol on schematic (Circle with “M” underlined)

schematicssymbol [~]

I have a symbol on my schematic but I cannot figure out what is this? I looked through Internet and didn't find anything(
enter image description here

Is this a microphone? If so give me some helpful links to learn something about it. I have to draw this element and make a pattern for it. So links for pattern would be also great.
The whole scheme looks like this:

enter image description here

Best Answer

Now you've added the full schematic, that's almost certainly a motor and not a microphone.

The four MOSFETs, VT3, VT4, VT5, and VT6 form an "H-bridge" circuit which is a very common way of driving a motor with bidirectional control.

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