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periscope British & World English

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 depth British & World English

The depth at which a submarine's periscope will just break the surface of the water.

trench periscope British & World English

A kind of periscope used in trench warfare to observe enemy lines from inside one's own trenches.