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International System of UnitsCGS systemDecimal systemMetric systemMKS systemElectric and magnetic unitsEnglish units of measurementWeights and measuresMeasurementPrefixesFraction

Prefixes

factorsymbolprefix
10-1ddeci
10-2ccenti
10-3mmilli
10-6μmicro
10-9nnano
10-12ppico
10-15ffemto
10-18aatto
10-24yyocto
factorsymbolprefix
101dadeca
102hhecto
103kkilo
106Mmega
109Ggiga
1012Ttera
1015Ppeta
1018Eexa
10-21zzepto
1021Zzetta
1024Yyotta
source: The Columbia Encyclopedia, Sixth Edition. 2001.