Names of small numbers


This article lists and discusses the usage and derivation of names of small numbers.

Table of names

The following table lists English language names of small numbers used in the long and short scales, along with the power of 10, engineering notation, and International System of Units symbols and prefixes.
Power
of
ten		Engineering
notation		Short scale
Long scale
SI
prefix		SI
symbol
1001OneOne
10−1100×10−3One TenthOne Tenthdeci-d
10−210×10−3One One-HundredthOne One-Hundredthcenti-c
10−31×10−3One One-ThousandthOne One-Thousandthmilli-m
10−61×10−6One One-MillionthOne One-Millionthmicro-µ
10−91×10−9One One-BillionthOne One-nano-n
10−121×10−12One One-TrillionthOne One-Billionthpico-p
10−151×10−15One One-QuadrillionthOne One-femto-f
10−181×10−18One One-QuintillionthOne One-Trillionthatto-a
10−211×10−21One One-SextillionthOne One-zepto-z
10−241×10−24One One-SeptillionthOne One-Quadrillionthyocto-y
10−271×10−27One One-Octillionths
10−301×10−30One One-NonillionthOne One-Quintillionth