Symbol 3675 from ISO 7000 - Title/Meaning: Transmission sensitivity, setting, medium 
Function/description: To identify the control that activates the medium sensitivity setting for the transmission. To indicate that the transmission sensitivity is set to medium sensitivity.
Own work using: iso.org/obp/graphics/grs/62f52eea-4f3a-43ad-b28a-3b0b97d8f849 200.png
Vectorization:  Mrmw