Symbol 5288(2002-10-07) from IEC 60417 - Title/Meaning: Dubbing Function/description: To identify the control for substitution, addition or mixing of sound.
Additional information: 
Published in: Supplement K, 1991
Own work using: iso.org/obp/graphics/grs/b9a075f2-a727-44cb-8de5-f1de54e1ebdf 200.png
Vectorization:  Mrmw