Comma

A Dictionary of Musical Terms · 1895 · p. 3

1. A comma (,) is often used as a breathing-mark.—2. (a) Didymic or syntonic c.: The difference between the greater and le er whole tone, or 80:81; (4) Pythagorean Cu, OF ¢. maxima: The difference between the octave of a given tone and a tone 6 whole tones higher than the given tone, or 524288:531441.