Jackknife

Jackknife is:

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• a pocket knife
• A configuration resembling a pocket knife opened to an acute angle.
• an unnatural position for a vehicle, such as a tractor and semi-trailer or a train.
• a position of the human body in the following disciplines: wrestling, diving, and abdominal exercise.
• a permutation test used in resampling statistics (see also: bootstrapping) first thought of and applied by Richard von Mises
• a fish of the Genera Equetus
 
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