Blackout

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

A blackout during war, or in preparation for an expected war, is the practice of collectively minimizing outdoor light, including upwardly directed (or reflected) light.

Excerpt from the Wikipedia article “Blackout (wartime)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Created by W.P.A. Art Program, Public domain, via Wikimedia Commons.