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
If you mistype something, that’s a typo. But what do you call it when your voice-to-text program mistypes as you’re dictating? Is that a mico, as in microphone? Plus, the word sycophant has a long and surprising history that goes all the way back to...
Claire from Philadelphia, Pennsylvania, shares a phrase dear to her late friend. Her friend was known for saying since Christ left Philadelphia, meaning “a very long time ago.” This expression fits a well-worn pattern of comic hyperbole using...