Symbol 5288 from IEC 60417 - Title/Meaning: Dubbing Function/description: To identify the control for substitution, addition or mixing of sound.
Additional information: 
See also IEC 60417-5547, IEC 60417-5548, and IEC 60417-5549.
The use of this symbol in an outlined form is deprecated to avoid potential confusion with ISO 7000-1326
Published in: Supplement K, 1991
Own work using: iso.org/obp/graphics/grs/46365272-d5a3-4950-9fe3-873b2563a5e9 200.png
Vectorization:  Mrmw