periscope
per·i·scope / ˈperəˌskōp/ • n. an apparatus consisting of a tube attached to a set of mirrors or prisms, by which an observer (typically in a submerged submarine or behind a high obstacle) can see things that are otherwise out of sight.
periscope
periscope Optical instrument consisting of a series of mirrors or prisms that allows a person to view the surroundings from a concealed position by changing the direction of the observer's line of sight. Since World War I, the periscope has been most commonly associated with submarines.
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periscope