These are Up Shift Light Indicator symbols. A handful of vehicle manufacturers use this light in vehicles with manual transmissions to indicate when it is best to shift to a higher gear for optimum fuel economy.
And there’s another …
The symbols themselves are green, indicating that they are intended to be informative and helpful and not warnings. One image includes a plus sign in a bumpy circle, which represents a mechanical flywheel. The other is an up-pointing arrow and the simple word SHIFT.
Do not confuse the second image with the Settings Indicator symbol on the left. It is nearly identical to the bumpy circle used when referring to the transmission, but lacks any addition in the center and is shown in gray scale. The settings indicator will most generally be seen in the separate Information Display.
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