In Just/Rational Intonation tunings, ratios are often categorized by the prime numbers that constitute them. The Latin-derived terms "tertial" and "quintal," initiated by composer Catherine Lamb, are used to semantically describe the color and function qualities of the specific primes referenced (3 and 5), as well as the chordal and scale structures these primes generate. Higher primes have traditionally been named in similar manner, i.e. "septimal" (7), "undecimal" (11), "tridecimal" (13), etc.


22-EDO, 24-EDO, 31-EDO, 35-EDO, 36-EDO, 41-EDO, 43-EDO, 53-EDO, 55-EDO, 72-EDO, Introduction to Just or Rational Intonation (JI), 12 HS 16-32 (Johnston), 12 HS 16-32 (Tenney), 12 Quintal (center C), 12 Quintal-Septimal (center C), 12 Undecimal Lou Harrison National Steel, 16 HS 16-32 (fundamental F), 43 Undecimal Partch G-392Hz