Cat's eye

Rarity: Common

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What Wikipedia says

A cat's eye, or road stud, is a retroreflective safety device used in road marking and was the first of a range of raised pavement markers. The cat's eye, when illuminated by the lights of an approaching car, becomes very visible as a marker.

Excerpt from the Wikipedia article “Cat's eye (road)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: No machine-readable author provided. Loganberry~commonswiki assumed (based on copyright claims)., Public domain, via Wikimedia Commons.