Syntonic comma

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Notion

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Science and technology

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What Wikipedia says

In music theory, the syntonic comma, also known as the chromatic diesis, the Didymean comma, the Ptolemaic comma, or the diatonic comma, is a small comma type interval between two musical notes, equal to the frequency ratio ⁠81/80⁠ (= 1.0125) (around 21.51 cents).

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

Image: Hyacinth, Public domain, via Wikimedia Commons.