periscopes

/P EH1 R AH0 S K OW0 P S/
noun
  1. 1

    A form of viewing device that allows the viewer to see things at a different height level and usually with minimal visibility.

  2. 2

    : A general or comprehensive view.

Source: https://en.wiktionary.org/wiki/periscope, https://en.wiktionary.org/wiki/periscopes