Rodan comma
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roda
(Shannon, [math]\sqrt{nd}[/math])
The rodan comma (monzo: [20 -17 3⟩, ratio: 131072000/129140163), otherwise known as the roda, is a small 5-limit comma of about 25.7 cents. It is the difference between the Pythagorean diatonic semitone (256/243) and a stack of three syntonic commas. Tempering it out leads to the 5-limit version of rodan.