Symbol 2658 from ISO 7000 - Title/Meaning: Simultaneous transmission Function/description: To identify the control for simultaneous transmission; to identify that simultaneous transmission is occurring or enabled.
Additional information: 
Symbol can be used in conjunction with symbols ISO 7000-1965 (Transmit page/document) and ISO 7000-1966 (Receive page/document).
Own work using: iso.org/obp/graphics/grs/b3a578c1-840d-47a7-b508-08aa8fcba3cb 200.png
Vectorization:  Mrmw