Septimal ennealimma

Septimal ennealimma, no-five ennealimma, or tritrizo comma is an unnoticeable 7-limit comma defined as 40353607/40310784 and measuring 1.838 cents. It arises as a stack between 9 7/6s and 2 octaves.

Tempering it out leads to the 7-limit version of the ennealimmal temperament, which is a subset of the tritrizo clan.