Symbol 5549 from IEC 60417 - Title/Meaning: Record muting Function/description: To identify the control to make a muted part on the track during a recording process.
Additional information: 
Published in: Supplement M, 1994
Own work using: iso.org/obp/graphics/grs/ce399413-1791-4b9b-b21e-f8f5bc39e449 200.png
Vectorization:  Mrmw