Symbol 1861 from ISO 7000 - Title/Meaning: Level 2 select Function/description: To identify the control to select the set of characters or functions allocated to the level 2 on the keyboard in the currently active group.
Additional information: 
The meaning of the symbol depends on its orientation.
Own work using: iso.org/obp/graphics/grs/60041ac0-2f8e-48f0-91c6-7ee973d8facd 200.png
Vectorization:  Mrmw