What are those blue stickers on light poles on N Cloverdale, I think between McMillan and Ustick?

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The original was posted on /r/Boise by /u/Imhopeless3264 on 2023-06-26 01:58:58+00:00.

I’ve been meaning to ask but kept forgetting to do so until today! There’s a couple cross-country skier signs, I think a sail boat, swimmers? I’ve seen signs like this in Florida, but not here! What’s the scoop? Thanks!