There are 12 universally identifiable musical notes (pitch classes of Chromatic scale or Swara-prakara) in a Saptak (Octave).They indicate 'a musical note or scale degree, but Shruti is a more subtle division of the octave'. The recent research has shown that 10 out of 12 of these notes (Swaraprakaras) have a 'spread' or a 'region' on a string (Swara-kshetra in Sanskrit) in which, 'any' frequency leads to the perception of the 'same' note by the human ear, and the perception 'changes' at both the ends. The remaining 2 notes, namely the Fundamental frequency (Shadja) and the perfect 5th (Panchama) have a 'single point' on which they are placed on the string by nature. Thus, the 10 notes give 20 Shrutis, and along with the 2 points of Fundamental frequency (Shadja) and the Perfect 5th (Panchama), a natural system of 22 Shrutis can be observed and played on any string.