What do the half moons mean? Nowhere in documentation.
A sharp terrain break. Often a perpendicular angle of 90 degrees.
From our own experience 10-30m
Makes sense. This is Zion national park in Utah. Thank you.
@Condor - thank you for excellent answer. Basically this symbol use all OpenStreetMap elements tagged as cliff: https://wiki.openstreetmap.org/wiki/Tag:natural%3Dcliff
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