Semicanousma

The semicanousma, 14641/14580 = [-2 -6 -1 0 4⟩ is a 11-limit comma measuring about 7.2 cents, named for it is one of the commas tempered out in semicanou temperament.

It is notable as the difference between 121/120, the biyatisma, and 243/242, the rastma. Tempering it out equates the two and splits an exact or approximate 81/80 into two equal parts. It identifies 20/11 by three 11/9's stacked, so an octave is also divided into 11/9-11/9-11/9-11/10.