Symbol 5511 from IEC 60417 - Title/Meaning: Menu Function/description: To identify the control by which the menu (availability of options) can be displayed.
Additional information: 
Published in: Supplement M, 1994
Own work using: iso.org/obp/graphics/grs/582fd3d8-3fe3-4ee6-87d5-34a18230753a 200.png
Vectorization:  Mrmw