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In technical terms, a sone is a unit of perceived loudness. It was proposed by S.S. Stevens in 1936. One sone is equal to the loudness of a 1000-hertz tone at a sound pressure level of 40 decibels above the standard reference level. This unit is used in acoustics to measure how the human ear perceives sound intensity, which is not always linear relative to physical pressure.

may refer to a specific time or a secondary date (February 23).