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attoparsec 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. Thus, one attoparsec per {microfortnight} is about one inch per second. This unit is reported to be in use (though probably not very seriously) among hackers in the UK. [{Jargon File}] (1996-12-08) 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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