Symbol 5865 from IEC 60417 - Title/Meaning: Tune, normal key Function/description: To identify the function to reset to the default musical pitch.
Additional information: 
Published in: Amendment 2, 2002,3C/677/FDIS,3C/577/CDV,3C/493/CD,3C(Treviso/Secretariat)10
Own work using: iso.org/obp/graphics/grs/1cc32c5e-21d4-47ba-97f2-ae47e3bc50f8 200.png
Vectorization:  Mrmw