What is another word for periscopes?
Pronunciation: [pˈɛɹɪskˌə͡ʊps] (IPA) 
Periscopes are optical instruments that allow users to view objects that are not otherwise visible. They are commonly used in submarines, tanks, and other military vehicles to see beyond obstacles. There are several synonyms for periscopes, including sighting tubes, observer periscopes, and viewing ports. Some other terms commonly used when discussing periscopes include optical periscopes, prism periscopes, and signal mirrors. Essentially, all of these words refer to devices that enable users to see what is happening in their surroundings without exposing themselves to danger or leaving their position. While they may have different names, they all serve the same purpose and are essential parts of many military vehicles and equipment.
