Symbol 5711 from IEC 60417 - Title/Meaning: Probe for circular sound field Function/description: To identify the control or the indicator to activate an ultrasound probe to generate a circular sound field and to identify the corresponding connector.
Additional information: 
Published in: Amendment 2, 2002,3C/452/FDIS,62A/228/CDV
Own work using: iso.org/obp/graphics/grs/27e79223-ce0f-4a23-8833-cc7f7ee53db3 200.png
Vectorization:  Mrmw