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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