Symbol 5355 from IEC 60417 - Title/Meaning: Radiodiagnostic automatic control system Function/description: To identify controls or indicators for automatic control of irradiation, for example of an automatic exposer.
Additional information: 
This symbol is shown here with three rectangular dominant areas
Published in: Supplement G, 1985
Own work using: iso.org/obp/graphics/grs/93b6d83a-0183-4183-843e-74596af98495 200.png
Vectorization:  Mrmw