Mil
来自Big Physics
late 17th century: from Latin millesimum ‘thousandth’, from mille ‘thousand’.
wiktionary
etymonline
mil (n.)
1721, in per mil "per thousand," from Latin mille "thousand" (see million); compare percent. As a unit of length for diameter of wire (equal to .001 of an inch) it is attested from 1891; as a unit of angular measure it is recorded by 1907.
