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In military lingo, a “klick” is shorthand for “kilometer”. Although the exact origin of the term is unknown, it is believed to have originated with Australian soldiers in Vietnam, who would use the gas regulator on their rifles to count off the distances they had hiked. They did so by moving it forward one mark for every 100 meters traveled, then reset it on the 10th interval, which resulted in an audible click for every kilometer hiked.