Symbol 6176 from IEC 60417 - Title/Meaning: Alternative position Function/description: [To indicate the status of a switch and to identify the switch position being neither ON nor OFF.;On transfer switching equipment (TSE).;To indicate a contact position of the equipment when the load circuit is switched on the alternative (emergency) supply in the event of a monitored supply deviation of the normal supply.]
Additional information: 
The meaning of the symbol depends upon its orientation.
Own work using: iso.org/obp/graphics/grs/a9d2f2ee-341b-42aa-b032-38d0621946ca 200.png
Vectorization:  Mrmw