Symbol 6344-2 from IEC 60417 - Title/Meaning: Finger/hand angle, lower Function/description: To indicate that the subject needs to lower the angle of the finger(s).
Additional information: 
See also IEC 60417-6341 and IEC 60417-6344-1.
Own work using: iso.org/obp/graphics/grs/5908bd43-da1d-41d0-a934-0d9ff671aab0 200.png
Vectorization:  Mrmw