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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-.