# Names of small numbers

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This article lists and discusses the usage and derivation of names of small numbers.[1]

## 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 ten, engineering notation, and International System of Units (SI) symbols and prefixes.[2][3][4][5][6][7][8]

Power
of
ten
Engineering
notation
Short scale
(U.S. and
modern British)
Long scale
(continental Europe,
archaic British, and India)
SI
symbol
SI
prefix
100 1 One One
10−1 100×10−3 Tenth Tenth d deci-
10−2 10×10−3 Hundredth Hundredth c centi-
10−3 1×10−3 Thousandth Thousandth m milli-
10−4 100×10−6 Ten thousandth Ten thousandth
10−5 10×10−6 Hundred thousandth Hundred thousandth
10−6 1×10−6 Millionth Millionth µ micro-
10−9 1×10−9 Billionth Milliardth n nano-
10−12 1×10−12 Trillionth Billionth p pico-
10−15 1×10−15 Quadrillionth Billiardth f femto-
10−18 1×10−18 Quintillionth Trillionth a atto-
10−21 1×10−21 Sextillionth Trilliardth z zepto-
10−24 1×10−24 Septillionth Quadrillionth y yocto-
10−27 1×10−27 Octillionth Quadrilliardth
10−30 1×10−30 Nonillionth Quintillionth

## References

1. ^ "Binary Numbers - Floating Point". Turing.cs.camosun.bc.ca. 1997-02-24. Retrieved 2014-07-07.
2. ^ American Heritage Dictionary, 4th edition, ISBN 0-395-82517-2. [1]
3. ^ Oxford English Dictionary, New Edition, Oxford, UK: Oxford University Press. [2] (subscription required)
4. ^
5. ^ US NIST Definitions of the SI units: The twenty SI prefixes
6. ^ "Large and Small Numbers - Metric Prefixes". 2012-08-26. Archived from the original on 2013-07-24. Retrieved 2014-07-07.
7. ^ "ThinkQuest". Library.thinkquest.org. 2013-07-01. Retrieved 2014-07-07.
8. ^ Manske, Magnus (2011-05-02). "Names of large and small numbers". Archived from the original on 2011-09-03. Retrieved 2014-07-07.