Across the hundreds of ski resorts across North America, and many other regions around the world—you’ll see the same three symbols: a green circle, a blue square, and a black diamond. So how did these symbols come to be in the first place?

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0:00 Intro
0:48 Rating System Origins
2:05 Green Circle Beginner Terrain
3:57 Blue Square Intermediate Terrain
5:47 Black Diamond Advanced Terrain
8:08 Double Black Diamond Expert Terrain
9:25 EX/Triple Black Diamond Extreme Terrain
12:26 Orange Oval Freestyle Terrain
13:31 Final Thoughts

Thanks to @skitnb for the Lone Peak footage at Big Sky in this video!