Symbol 1951 from ISO 7000 - Title/Meaning: No operator response from remote station 
Function/description: To identify the display panel indicator which signifies that the remote station operation is not responding.
Own work using: iso.org/obp/graphics/grs/246e25d6-f9b7-4f70-afd7-3a5313dbfa9c 200.png
Vectorization:  Mrmw