tricomma

The interval formed of three Pythagorean commas, and thus having the ratio 150094635296999121:144115188075855872 [= 2^-573³⁶ = 0.70 Semitones = ~70.38003115 cents].

The Pythagorean tricomma is very close in size to the 5-limit "chromatic semitone" with the ratio 25:24 [= 2^-33^-15² = ~70.67242686 cents], the difference forming the interval of a monzisma.

REFERENCE: Yahoo Tuning Group message 22165, Sun May 6, 2001 7:13 am.

see also anomaly, unison vector, xenharmonic bridge

[from Joe Monzo, JustMusic: A New Harmony]

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