Mateusz: "arête" is usually spelled "arete" in my experience (reading climbing websites).
I don't like natural=arete much, partly for the reasons mateusz outlines, and partly because of ambiguity in the meaning of the term. My familiarity with the term comes from being a mountaineer in western Canada. Most of the things that the Wikipedia refers to as aretes are coloquially called ridges here, and the term arete typically refers to a steep ridgeline (not unlike a buttress, or maybe a spur). In addition to this, most people have never heard the term arete (it is mountaineer/geologist jaron) and so I suspect that this will just end up causing confusion.
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