epsilon
= E =
era
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.
--The Jargon File version 4.3.1, ed. ESR, autonoded by rescdsk.