Symbol 5982 from IEC 60417 - Title/Meaning: X-ray field, not limited by shutters Function/description: To identify the control or the indicator to completely open the shutters of the beam limiting device, or to indicate that the beam limiting device is not present.
Additional information: 
Published in: 3C/1454/FDIS, 3C/1469/RVD
Own work using: iso.org/obp/graphics/grs/785c6525-746b-484e-8f5e-d75ea6eb3ae3 200.png
Vectorization:  Mrmw