This is an Economy (ECO) Mode Operation Indicator symbol. Auto makers incorporate any number of automated operation adjustments to make a vehicle more green or fuel efficient at the touch of a button. ECO mode may reduce the setting of the air conditioner or the amount of torque delivered to the drive system. A fuel-use meter may also be visible on the instrument panel of vehicles with an ECO mode option.
Some manufacturers use a leaf image (tree or plant) symbol to indicate that Economy Mode has been selected. Note that a pictorial ECO symbol also exists, which only shows that a vehicle is being operated economically, and not in a chosen mode. See here.
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