Symbol 5721 from IEC 60417 - Title/Meaning: Dynamic range Function/description: To identify the control or the indicator to change the dynamic range, for example on diagnostic ultrasound equipment.
Additional information: 
Published in: Amendment 2, 2002,3C/473/FDIS,62A/228/CDV
Own work using: iso.org/obp/graphics/grs/d8f4de40-acdc-414a-bca8-0de175e578a1 200.png
Vectorization:  Mrmw