2:sqrt(6):3

2:sqrt(6):3 is the hemipythagorean neutral triad, formed of 2 hemipythagorean neutral thirds stacked to form a perfect fifth. It is the radical interpretation of a neutral chord, and it is the unique triad bounded by a perfect fifth 3/2 that is identical to its reflection. 2:sqrt(6):3 is perfectly tuned in 2edf and its multiples, though any temperament in which 3/2 is mapped to an even number of steps has a tuning for it.