Octave 2
Octave 2 : A unit used in music to describe the ratio in frequency between notes. Two notes differ by one octave if the higher note has exactly twice the frequency of the lower one. The name, derived from the Latin numeral 8 (octo), refers to the traditional sequence of 8 notes in the musical scale (in English: do, re, mi, fa, so, la, ti, do). Both ends of the scale are included, so 2 octaves include 15 notes (first do through third do) instead of 16. Outside of music, the octave is also used to describe a group of 8 objects sequenced somewhat like musical notes. For example, in the Christian religious calendar an octave is a period of 8 days beginning with a feast day and ending with the day one week after the feast day
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