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.
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.
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