Symbol 2551 from ISO 7000 - Title/Meaning: Taxi sign light 
Function/description: To identify the control that activates or deactivates a sign reading TAXI located on the roof of the vehicle. To indicate the operational status of the TAXI light.
Own work using: iso.org/obp/graphics/grs/abcaefb7-a5e3-4f7e-9de8-40843442fe8d 200.png
Vectorization:  Mrmw