infinity

infinity n.  1. The largest value that can be represented in
   a particular type of variable (register, memory location, data
   type, whatever).  2. `minus infinity': The smallest such value,
   not necessarily or even usually the simple negation of plus
   infinity.  In N-bit twos-complement arithmetic, infinity is
   2^(N-1) - 1 but minus infinity is -
   (2^(N-1)), not -(2^(N-1) - 1).  Note also that this
   is different from "time T equals minus infinity", which is
   closer to a mathematician's usage of infinity.