Symbol 1862 from ISO 7000 - Title/Meaning: Group lock Function/description: To identify the control to sustain the state of the selected group.
Additional information: 
The meaning of the symbol depends on its orientation.
Own work using: iso.org/obp/graphics/grs/7c5d63f9-c15c-4cc5-9b99-ff7120d11f97 200.png
Vectorization:  Mrmw