Blackjackisma
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(Shannon, [math]\displaystyle{ \sqrt{nd} }[/math])
The blackjackisma (monzo: [-10 7 8 -7⟩, ratio: 854296875/843308032) is a small 7-limit comma. It is the amount by which a stack of seven 15/14's exceeds the classical minor sixth (8/5).
Temperaments
Tempering out this comma in the 7-limit results in the rank-3 blackjackismic temperament.
Etymology
This comma was named by Gene Ward Smith in 2011 for the fact that the Blackjack scale contains a pump for this comma[1].