Ragisma
In music and tuning, the ragisma is an interval with the ratio of 4375:4374, ≈0.396 cents. It is usually defined as the difference between the septimal [minor third] and two Bohlen–Pierce small semitones. It is also the difference between minor Bohlen–Pierce diesis and septimal semicomma, as well as the difference between the septimal third tone and the greater diesis.