Symbol 5984 from IEC 60417 - Title/Meaning: Radiodiagnostic automatic control system, field selection Function/description: To identify the control or the indicator for the active dominant area (active field) of the radiodiagnostic automatic control system.
Additional information: 
This symbol is shown here with three rectangular dominant areas.
This symbol is shown with the lower dominant area selected.
See also symbol 5355
Published in: 3C/1477/CDV, 3C/1519/RVC
Own work using: iso.org/obp/graphics/grs/888862ab-39aa-4b60-b580-0a13647ea4bc 200.png
Vectorization:  Mrmw