Alphatricot comma
The tricot comma, with monzo [39 -29 3⟩, is a 5-limit unnoticeable comma measuring about 2.2 cents. It is the different between a stack of three schismas and the 53-comma, making it part of the Schismic-Mercator equivalence continuum. In addition, it is the difference between a stack of three 10/9 intervals and a stack of twenty-three 3/2 perfect fifths octave-reduced.
Temperament
Tempering out this comma leads to the tricot family of temperaments.