attoparsec
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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-.

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