6561/6400
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| Ratio | 6561/6400 |
| Factorization | 2-8 × 38 × 5-2 |
| Monzo | [-8 8 -2⟩ |
| Size in cents | 43.012579¢ |
| Name | double syntonic comma |
| Color name | lagugu unison, Lgg1 |
| FJS name | [math]\text{P1}_{5,5}[/math] |
| Special properties | reduced |
| Tenney height (log2 nd) | 25.3236 |
| Weil height (log2 max(n, d)) | 25.3594 |
| Wilson height (sopfr(nd)) | 50 |
| Harmonic entropy (Shannon, [math]\sqrt{nd}[/math]) |
~4.51245 bits |
[sound info] | |
| open this interval in xen-calc | |
6561/6400, the double syntonic comma, is equal to two 81/80's stacked or (81/80)2.
Sagittal notation
In the Sagittal system, the downward version of this comma (possibly tempered) is represented by the sagittal and is called the 25 small diesis, or 25S for short, because the simplest interval it notates is 25/1 = 5×5 (equiv. 25/16), as for example in E -B . The upward version is called 1/25S or 25S up and is represented by .