Symbol 5083 from IEC 60417 - Title/Meaning: Stereophonic microphone Function/description: To indicate a reference to a stereophonic microphone.
Additional information: 
If no ambiguity can arise, the inner graphical element, symbol 5071 ""stereophonic,"" may be used without the surrounding microphone symbol.
See also symbols 5082 and 5913
Published in: 3C/844/FDIS;First edition, 1973
Own work using: iso.org/obp/graphics/grs/e08c5185-71c9-4eb0-8f64-470ca4b8fca5 200.png
Vectorization:  Mrmw