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epsilon squared

epsilon squared: n. A quantity even smaller than epsilon, as
   small in comparison to epsilon as epsilon is to something normal;
   completely negligible.  If you buy a supercomputer for a million
   dollars, the cost of the thousand-dollar terminal to go with it is
   epsilon, and the cost of the ten-dollar cable to connect them
   is epsilon squared.  Compare lost in the underflow, lost
   in the noise.