There's a certain parallel to draw with the Iron Ring/Engineer's Ring[1,3]. Quoting from the latter article: The Iron Ring is worn on the little finger ("pink

There's a certain parallel to draw with the Iron Ring/Engineer's Ring[1,3]. Quoting from the latter article: The Iron Ring is worn on the little finger ("pinky") of the working (dominant) hand; this would be the left hand for a left-handed person.[2] There, the facets act as a sharp reminder of one's obligation while the engineer works, because it could drag on the writing surface while the engineer is drawing or writing. This is particularly true of recently obligated engineers, whose rings bear sharp, unworn, facets [1] https://en.wikipedia.org/wiki/Iron_Ring https://en.wikipedia.org/wiki/Iron_Ring [2] NMF [3] https://en.wikipedia.org/wiki/Engineer%27s_Ring https://en.wikipedia.org/wiki/Engineer%27s_Ring