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Even some people at Tesla service might not know. I called to ask about, among other things,
a little amber triangle that appears near the regen region of the power meter sometimes. The
person I spoke with had no idea, but I later inferred that it is there at vehicle start-up time to call
your attention to the fact that regen is limited due to cold, highly charged batter, or whatever.
Then it goes away, leaving only the amber portion of the regen region.
I like the "it's an up-coming yellow light -- floor it!" indicator interpretation
Through multiple times cleaning the console I never saw that it was a tiny speck of something crusted there. It was invisible until the sun hits it at a certain angle making it glow. I've scraped it off.