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InvisiblePinkUnic0rn posted on r/symbology1w
It looks like it could be a trail marker, maybe snowmobile related https://www.snowmobile-ed.com/indiana/studyGuide/Route-Signs-and-Trail-Markers/501016_90591/https://www.amazon.com/dp/B0055DOKXA?lv=shuf&channelId=500&plpRedirect=mhFallbackhttps://www.denniskirk.com/voss-signs/orange-plastic-reflective-snowmobile-blazer-diamond-sign-264-rb-or.p5207395.prd/5207395.sku