Whether it is from an electronically controlled transmission or throttle (ECT) or in a hybrid vehicle, either symbol indicates that this mode is active. The option controls the transmission electronically, and is chosen by buttons featuring the same symbol. The result is to keep the transmission in a lower gear longer for more powerful acceleration.
In more rare cases, the option may indicate control of the throttle in order allow more powerful or deliberate acceleration.
There will likely be additional text with the abbreviation PWR. See the Acronyms page if it is not a whole word.
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