witness mark
n.— «The laminations can be designed to accommodate flipping, or alternation as noted above, to average out asymmetries. The design should incorporate a “witness mark” so that the pattern of alternation is evident.» —by Alexander Wu Choo, Maruy Tigner Handbook of Accelerator Physics and Engineering Mar. 26, 1999. (source: Double-Tongued Dictionary)
Further reading
One of the most powerful words you’ll ever hear — and one of the most poignant — isn’t in dictionaries yet. But it probably will be one day. The word is endling, and it means “the last surviving member of a species.” The...
Quiz Guy John Chaneski was inspired by a version of film in which a filmmaker went to the trouble to take a clip of every word used in the movie The Wizard of Oz, arranging them in alphabetical order, all the way to the Tin Man’s saying zipper...