Symbol 2028 from ISO 7000 - Title/Meaning: Control Function/description: To identify the control for activate a function under application control.
Additional information: 
The key marked with this symbol must be used in conjunction with another key relevant to the required function.
Own work using: iso.org/obp/graphics/grs/683cc41a-528b-4e7f-8e70-9d35d7a6831d 200.png
Vectorization:  Mrmw