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Some similarity seems to be present here:
https://en.wikipedia.org/wiki/A440_(pitch_standard)
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It says :

  • If you are interested in why 440Hz here is an explanation from the Wikipedia.
    A440 or A4 (also known as the Stuttgart pitch), which has a frequency of 440 Hz, is the musical note of A above middle C and serves as a general tuning standard for musical pitch.

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