Symbol 6088 from IEC 60417 - Title/Meaning: Switch to specific mode, general Function/description: To identify the control of the group to be switched to.
Additional information: 
This is a generic symbol.
The letter symbol “A” is to be replaced by a typical character, for example, a group containing mathematical symbols is indicated by a turned small e.
Own work using: iso.org/obp/graphics/grs/c6e25f20-9ef6-4c41-8aa0-ec9042d2481c 200.png
Vectorization:  Mrmw