Diesel Exhaust Filter Indicator Light
The Diesel Exhaust Fluid (DEF) creates a catalytic reaction that extracts harmful particles from the exhaust. When DEF is low, it must be topped off, and this light indicates that it is low. If this fluid becomes contaminated, it must be replaced.
This is a different particle filter symbol. It sometimes contains an exclamation mark in, which indicates an emissions system failure or that the vehicle is producing too much emissions.