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attoparsec: n. About an inch. `atto-' is the standard SI
   prefix for multiplication by 10^(-18).  A parsec
   (parallax-second) is 3.26 light-years; an attoparsec is thus
   3.26 * 10^(-18) light years, or about 3.1 cm (thus,
   1 attoparsec/microfortnight equals about 1 inch/sec).  This
   unit is reported to be in use (though probably not very seriously)
   among hackers in the U.K.  See micro-.