A440

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Notion

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Science and technology

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What Wikipedia says

A440 (also known as Stuttgart pitch) is the musical pitch corresponding to an audio frequency of 440 Hz, which serves as a tuning standard for the musical note of A above middle C, or A4 in scientific pitch notation. It is standardized by the International Organization for Standardization as ISO 16.

Excerpt from the Wikipedia article “A440 (pitch standard)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Édouard Hue (User:EdouardHue), CC BY-SA 3.0, via Wikimedia Commons.