Chinese era name

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Notion

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Science and technology

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What Wikipedia says

Chinese era names, also known as reign mottos, were titles used by various Chinese dynasties and regimes in Imperial China for the purpose of year identification and numbering. The first monarch to adopt era names was the Emperor Wu of Han in 140 BCE, or more formally in 110 BCE.

Excerpt from the Wikipedia article “Chinese era name”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: The original uploader was Immanuel Giel at German Wikipedia., CC BY-SA 3.0, via Wikimedia Commons.