It indicates the car speed.
See also:
“Temperature unit” (Temp. Unit)
To select temperature unit (°C or °F), proceed as follows:
...
Tire Terminology And Definitions
...
8. Generic Warning Light
The Generic Warning Light will illuminate if any of the following conditions
occur: Oil Change Request, Engine Oil Pressure Sensor Failure, External Light Failure,
Fuel Cut-Off Intervention, Fue ...