
What does this sign mean?
You may find it in different forms on certain car windows (I've seen in Toyotas and Tatas, mostly cabs, although not sure if this is brand specific)
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AI Overview: The sign shown in the image is a sticker used by ride-hailing services like Ola and Uber in India. It helps passengers identify the car as belonging to the service. It is not brand-specific but often found on Toyota and Tata vehicles, which are commonly used as cabs.
This sounds more apt

I'd rather look for the car make, model and color, followed by the registration number stated on the app to identify the car. A sticker on the window isn't exactly the thing one would notice (and that too without any education on the same). Doesn't seem apt at all, the AI just answered for answering's sake.

Folks, this is for the driver to quickly check if the windows are closed. Needed whenever they need to turn the AC on.
Cab drivers are more sensitive to their fuel economy which takes a slight hit with AC on, hence these signs are prevalent only on cabs.
