Symbol 5548 from IEC 60417 - Title/Meaning: Insertion of signals Function/description: To identify a control to insert simultaneously audio and video signals from audio equipment or other video equipment.
Additional information: 
Published in: Supplement M, 1994
Own work using: iso.org/obp/graphics/grs/4aba6a35-16ef-4306-bcfd-be2920772103 200.png
Vectorization:  Mrmw