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Scientific pitch notation is one of several methods that name the notes of the standard Western chromatic scale by combining a letter-name, accidentals, and a number identifying the pitch's octave. The definition of scientific pitch notation in this article is that proposed to the Acoustical Society of America in 1939[1], where C0 is in the region of the lowest possible audible frequency.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/4/41/Scientific_pitch_notation_octaves_of_C.png/320px-Scientific_pitch_notation_octaves_of_C.png)
Scientific pitch notation is a logarithmic frequency scale. Although pitch notation is intended to describe audible sounds, it can also be used to specify the frequency of non-audible phenomena. For example, when the Chandra X-ray Observatory observed pressure fronts propagating away from a black hole, the frequency of the waves was reported in the press as the B♭ 57 octaves below middle C, or B♭−53, corresponding to one oscillation every 10 million years.
Scientific pitch notation is an example of a note-octave notation (see below).