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. (1997-09-05)