Symbol 2459 from ISO 7000 - Title/Meaning: Roof sign illumination Function/description: To identify the control that activates or deactivates a sign located on the roof of the vehicle. To indicate the operational status of the roof sign.
Additional information: 
On road vehicles: loading platform and rear axle may be omitted if not needed.
Own work using: iso.org/obp/graphics/grs/69ebeab1-4cd1-4b8e-9786-f5a8ac2b3f27 200.png
Vectorization:  Mrmw