What is this counter in the progress bar?

I tried searching but I wasn’t sure what to call it and didn’t find anything. What is the number in the blue box (594,123) mean? It seems to increment every foot and the icon at the right changes back and forth between a mountain and something else.

They are Drops (virtual currency): https://zwiftinsider.com/how-drops-work/
and: https://zwiftinsider.com/drop-shop-release/
also this: https://zwift.com/news/13278-hard-work-pays-off-at-the-drop-shop/

Thank you, I searched all over but didnt’ know it had anything to do with drops.