$$\lfloor \nabla_{\mu} X_{\nu} + \nabla_{\nu} X_{\mu}\rfloor = 0$$
Hint1: Also a video game.
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Is it
Killing Floor by Howlin Wolf?
$\nabla_{\mu} X_{\nu} + \nabla_{\nu} X_{\mu} = 0$ is the "Killing equation", and $\lfloor x \rfloor$ is the floor function
answered Dec 11, 2015 at 17:33
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$\begingroup$ that was quick! (Not quite as cryptic as the first question, but just for fun!) - link between the two questions was going to be the next hint :) $\endgroup$– martinDec 11, 2015 at 17:35
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1$\begingroup$ @martin I think I managed to catch this while it was up earlier today, started trying to figure it out then. $\endgroup$ Dec 11, 2015 at 17:37
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$\begingroup$ early start! ... Hendrix did a cover of course ;) $\endgroup$– martinDec 11, 2015 at 17:40