As a "periscope" is an instrument for seeing above a surface of some kind (usually water) from below it, its use will typically occur in sentences dealing with military, exploration, or scientific subjects. Just one example would be, "The submarine was discovered by the scout plane through a fortuitous accident: the sunlight flashed off the glass lens of its raised periscope, revealing its location below the surface."
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Periscope is a live video streaming app that allows users to broadcast and watch live streams around the world.
You can use the word Periscope a few ways in a sentence. You can write the sentence I am going to periscope the website.
The captain of the submarine raised the periscope to see if there's danger.
The submarine's periscope and radar mast are damaged.
In paintball wars, a periscope is a handy way to look around a corner without getting shot. With only its periscope out of the water, a submarine was nearly impossible to spot at a distance.
Periscopes allow a submarine, when submerged at a shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air. When not in use, a submarine's periscope retracts into the hull.