Periscope

Rarity: Rare

A topic known well beyond its field, found in many languages.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Invention

Domain

Society

Knowledge cost

3

In collections

Nobody has pulled it yet.

What Wikipedia says

A periscope is a device for observation over, around or through an object, obstacle or condition that prevents direct line-of-sight observation from an observer's current position.

Excerpt from the Wikipedia article “Periscope”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Pearson Scott Foresman, Public domain, via Wikimedia Commons.