Sinarabian comma

Interval information

Ratio	85293/85184
Factorization	2-6 × 38 × 11-3 × 13
Monzo	[-6 8 0 0 -3 1⟩
Size in cents	2.213842¢
Name	Sinarabian comma
Color name	lathotrilu unison
FJS name	[math]\displaystyle{ \text{A1}^{13}_{11,11,11} }[/math]
Special properties	reduced
Tenney height (log2 nd)	32.7584
Weil height (log2 max(n, d))	32.7603
Wilson height (sopfr(nd))	82
Comma size	unnoticeable
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The Sinarabian comma is an 13-limit (also 2.3.11.13 subgroup) unnoticeable comma with a ratio of 85293/85184 and a value of approximately 2 cents.

This comma is identifiable as the amount by which a stack of two 88/81 artoneutral seconds falls short of a 13/11 Neo-Gothic minor third, and also the amount by which a stack of three 11/9 artoneutral thirds fall short of 117/64, and even the comma that separates 1053/1024 and 1331/1296.

In terms of comma relations, it separates 243/242 from 352/351, separates 144/143 from a stack of two instances of 243/242, and, is the sum of the frameshift comma and the tridecapyth comma.

Etymology

The name of this comma comes from a portmanteau of "Ibn Sina" and "Alpharabian", and was given by Aura on the basis of a series of connections between intervals that he found and shared with Margo Schulter, who took note of a variety of implications, the details of which will be added to this article later.