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"Milli" redirects here; for the village in Azerbaijan, see Birinci Milli; for the Lil Wayne song, see A Milli; for similar-sounding words, see Millie.

Milli (symbol m) is a prefix in the metric system denoting a factor of one thousandth (10−3).[1] Adopted in 1795, the prefix comes from the Latin mille, meaning one thousand (the plural is milia).


Metric prefixes
PrefixSymbol1000m10nDecimalEnglish word[n 1]Since[n 2]
yottaY 10008 10241000000000000000000000000septillion1991
zettaZ 10007 10211000000000000000000000sextillion1991
exaE 10006 10181000000000000000000quintillion1975
petaP 10005 10151000000000000000quadrillion1975
teraT 10004 10121000000000000trillion1960
gigaG 10003 1091000000000billion1960
megaM 10002 1061000000million1960
kilok 10001 1031000thousand1795
hectoh 10002/3 102100hundred1795
decada 10001/3 10110ten1795
 10000 1001one
decid 1000−1/3 10−10.1tenth1795
centic 1000−2/3  10−20.01hundredth1795
millim 1000−1 10−30.001thousandth1795
microµ 1000−2 10−60.000001millionth1960
nanon 1000−3 10−90.000000001billionth1960
picop 1000−4 10−120.000000000001trillionth1960
femtof 1000−5 10−150.000000000000001quadrillionth1964
attoa 1000−6 10−180.000000000000000001quintillionth1964
zeptoz 1000−7 10−210.000000000000000000001sextillionth1991
yoctoy 1000−8 10−24 0.000000000000000000000001septillionth1991
  1. ^ This table uses the short scale.
  2. ^ The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.


  1. ^ "NIST Guide to the SI". See section 4.3 Decimal multiples and submultiples of SI units: SI prefixes, Table 5.
  2. ^