Wizma
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(Shannon, [math]\sqrt{nd}[/math])
The wizma (monzo: [-6 -8 2 5⟩, ratio: 420175/419904) is an unnoticeable 7-limit comma measuring about 1.12 ¢. In terms of other commas, it is the difference between 245/243 and 1728/1715, and it is the sum of 2401/2400 and 4375/4374, the two smallest 7-limit superparticular commas.
Temperaments
Tempering out this comma alone in the 7-limit leads to the rank-3 wizmic temperament, where the septimal comma (64/63) is split into two equal parts, each for 245/243~1728/1715.
See Wizmic microtemperaments for a collection of rank-2 temperaments where it is tempered out.