what is a klick

In military terms, a klick is a term used to denote one kilometer or 1,000 meters, 0.6214 miles or 3,280.84 feet. The origin of the term is not clear, but it was likely invented in World War 1 or the Vietnam War. The term klick is commonly used by the US and UK military, which use the metric system almost exclusively in order to facilitate communication with allied forces. The term "klick" is interchangeable with "click" and both terms mean the same thing.