Comma

A comma is a small difference in pitch between the same interval in different tuning systems.

For example, the difference between the octave created by stacking 12 just fifths in Pythagorean tuningPythagorean tuning is an approach to tuning based on stacking pure fifths (i.e. fifths with an exact frequency ratio of 2:3).Visit the link to learn more and the just octave is called the Pythagorean comma:

Learning more:

• Wikipedia article on comma‍

Context

22-EDO, 24-EDO, 31-EDO, 35-EDO, 36-EDO, 41-EDO, 43-EDO, 53-EDO, 55-EDO, 72-EDO, Introduction to European historical tunings and temperaments, 12 Henricus Grammateus, 12 Meantone (one-fifth quintal-comma), 12 Meantone (one-quarter quintal-comma), 12 Meantone (one-sixth tertial-comma), 12 Meantone (one-third quintal-comma), 12 Meantone (two-sevenths quintal-comma), 12 WT (d'Alembert-Rousseau), 12 WT (Kellner), 12 WT (Kirnberger III), 12 WT (Lehmann), 12 WT (Marpourg), 12 WT (Neihardt Grosse), 12 WT (Neihardt Kleine), 12 WT (Rameau), 12 WT (Vallotti), 12 WT (Werkmeister III), 24 Helmholtz temperament, 12 HS 16-32 (Johnston), 12 HS 16-32 (Tenney), 12 Quintal (center C), 12 Quintal-Septimal (center C), 12 Tertial Dflat-Fsharp (center C), 12 Tertial-Septimal LMY WTP, 12 Undecimal Lou Harrison National Steel, 16 HS 16-32 (fundamental F), 22 Sruti (center C), 43 Undecimal Partch G-392Hz, 53 Tertial, 55 Tertial-Quintal Sabat Euler Lattice