Chi

Rarity: Common

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What Wikipedia says

The chi (Tongyong Pinyin chih) is a traditional Chinese unit of length. Although it is often translated as the "Chinese foot", its length was originally derived from the distance measured by a human hand, from the tip of the thumb to the tip of the forefinger, and is similar to the ancient span.

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

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