This is the Economy Operation Indicator symbol. With the push to improve fuel mileage, vehicles from many manufacturers will tell you when you are operating your vehicle economically. There may be a gauge of sorts also shown. Step on the gas to pass another car, for example, and this light will go out.
Do not confuse this symbol with other indicators using the abbreviation ECO and coupled with the word Mode. The use of the word Mode denotes that control of some of the drive systems has been chosen. See here.
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