Barium comma is a 5-limit interval that sets the difference between 56 syntonic commas and the octave, marking the closest approximation of the octave by stacking syntonic commas.

Interval information
Factorization 2-225 × 3224 × 5-56
Monzo [-225 224 -56
Size in cents 4.352217¢
Name Barium comma
Color name L24g56-8, quadtribila-sepquadbigu negative octave
FJS name [math]\displaystyle{ - }[/math]
Special properties reduced
Tenney norm (log2 nd) 710.06
Weil norm (log2 max(n, d)) 710.063
Wilson norm (sopfr(nd)) 1402
Comma size small
Open this interval in xen-calc

Tempering it out results in the barium temperament, which splits the octave into 56 equal parts. Some notable edos tempering out the barium comma are 224edo which is a zeta edo, and 2520edo which is a highly composite edo. The tuning systems which are not divisible by 56 cannot temper it out.