A four-hundred and forty Hertz tone that serves as the standard for musical pitch, and is the musical note A above middle C.
A440, which has a frequency of 440 Hz, is the musical note A above middle C and serves as a general tuning standard for musical pitch. Prior to the standardization on 440 Hz, many countries and organizations followed the Austrian government's 1885 recommendation of 435 Hz. The American music industry reached an informal standard of 440 Hz in 1926, and some began using it in instrument manufacturing. In 1936 the American Standards Association recommended that the A above middle C be tuned to 440 Hz. This standard was taken up by the International Organization for Standardization in 1955 as ISO 16. Although not universally accepted, since then it has served as the audio frequency reference for the calibration of acoustic equipment and the tuning of pianos, violins, and other musical instruments. A440 is widely used as concert pitch in United Kingdom and the United States. In continental Europe the frequency of the A is commonly 442 Hz and 443 Hz. In the period instrument movement, a consensus has arisen around a modern baroque pitch of 415 Hz, baroque for some special church music at 466 Hz and classical pitch at around 430 Hz.
The numerical value of a440 in Chaldean Numerology is: 1
The numerical value of a440 in Pythagorean Numerology is: 1
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