witness mark
n.— «Witness marks on the jack screws that drive the flaps and on other data indicate that Flight 801’s flaps had been placed in the landing setting of 30 deg., according to investigators.» —“Guam Probe Targets Weather, Altitude Alert” by James T. Mckenna Aviation Week & Space Technology Aug. 18, 1997. (source: Double-Tongued Dictionary)
Further reading
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