Head restraint

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

Head restraints (also called headrests) are an automotive safety feature, attached or integrated into the top of each seat to limit the rearward movement of the adult occupant's head, relative to the torso, in a collision—to prevent or mitigate whiplash or injury to the cervical vertebrae.

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

Image: KAKELU, Public domain, via Wikimedia Commons.