Symbol 2304 from ISO 7000 - Title/Meaning: Reverse/back-up lights 
Function/description: To indicate that the operational status of the reversing (back-up) lights.
Own work using: iso.org/obp/graphics/grs/b5583ac6-df3e-4562-810f-785290970ec1 200.png
Vectorization:  Mrmw