A "click" signifying distance of some sort???

Question

In some movies I hear the words "just a few clicks up the road" or "it's a about 5 clicks down the hill" etc. What distance or approximate distance is a "click?" Thanks you guys.. Ross
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Answer 1

It's "shorthand" for kilometer.

Answer 2

I first heard it used when I was in the Marines.

Answer 3

in miltary terms means one kilometer

Answer 4

less than a mini micro second