These are Automatic Transmission Oil Temperature Indicator symbols. Generally seen in red, it means exactly what it says, that the oil temperature in the transmission is too high, which risks transmission failure. Some manufacturers show the symbol as yellow/amber. Regardless of color, take the symbol seriously.
This indicator is generally in use only in 4- or all-wheel drive vehicles with towing packages. Pull over and allow the transmission to cool down or there is a risk of failure. There are still more symbols, below…
A picture symbol may also be used. It is a ‘bumpy ring’ with a thermometer symbol inside it. The ring is used to represent a transmission in a number of instances. Again, pull over and allow the transmission to cool down or there is a risk of failure.
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