Symbol 5044 from IEC 60417 - Title/Meaning: Signal strength attenuation, local/distant Function/description: To identify the switch by which the circuit is connected that attenuates stronger local signals in order to avoid overloading of input circuits.
Additional information: 
Title was editorially improved
Published in: First edition, 1973
Own work using: iso.org/obp/graphics/grs/06f73319-a042-4632-8742-35c7c9cd8cc6 200.png
Vectorization:  Mrmw