Symbol 5079 from IEC 60417 - Title/Meaning: Headset Function/description: To identify the socket, terminals or switch for a headset.
Additional information: 
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/89e8dbd7-f968-44bb-9e22-fa585053631e 200.png
Vectorization:  Mrmw