Dead man's switch

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

A dead man's switch is a switch that is designed to be activated or deactivated if the human operator becomes incapacitated, such as through abandonment, drowsiness, loss of consciousness, death, or being bodily removed from control.

Excerpt from the Wikipedia article “Dead man's switch”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Erik1980, CC BY-SA 3.0, via Wikimedia Commons.