Physics reference SI prefixes	28Rp4 PhysRef
A comphrensive table of all SI multiples and submultiples.
SI prefixes.

prefix	symbol	value	expanded value	English name
yotta	Y	1024	1 000 000 000 000 000 000 000 000	U.S. septillion; U.K. quadrillion
zetta	Z	1021	1 000 000 000 000 000 000 000	U.S. sextillion
exa	E	1018	1 000 000 000 000 000 000	U.S. quintillion; U.K. trillion
peta	P	1015	1 000 000 000 000 000	U.S. quadrillion
tera	T	1012	1 000 000 000 000	U.S. trillion; U.K. billion
giga	G	109	1 000 000 000	U.S. billion
mega	M	106	1 000 000	million
kilo	k	103	1 000	thousand
hecto	h	102	100	hundred
deca	da [footnote 1]	101	10	ten
		100	1	one
deci	d	10-1	0.1	tenth
centi	c	10-2	0.01	hundredth
milli	m	10-3	0.001	thousandth
micro	u [footnote 2]	10-6	0.000 001	millionth
nano	n	10-9	0.000 000 001	U.S. billionth
pico	p	10-12	0.000 000 000 001	U.S. trillionth; U.K. billionth
femto	f	10-15	0.000 000 000 000 001	U.S. quadrillionth
atto	a	10-18	0.000 000 000 000 000 001	U.S. quintillionth; U.K. trillionth
zepto	z	10-21	0.000 000 000 000 000 000 001	U.S. sextillionth
yocto	y	10-24	0.000 000 000 000 000 000 000 001	U.S. septillionth; U.K. quadrillionth

Legend.
prefix The name of the prefix, which is prepended directly before a unit name with no spaces. For instance, prepending the prefix mega to the SI unit joule gives the word megajoule. symbol The symbol of the prefix, to be used in conjunction with the symbol for a unit, following the rules above. For instance, one would write MJ for megajoule. value, expanded value The value of the prefix, written in an abbreviated matter and then expanded. English name The English name for the unit; if U.S. and U.K. nomenclature differs, then both versions are shown.
Footnotes.
1. The deca prefix is sometimes written deka and is abbreviated dk. Spellings may vary, but its official symbol is always da, not dk.	footnote 1
2. The micro prefix is actually represented by the Greek letter mu, but is represented as u throughout these pages.	footnote 2
Cross-references.
Physics reference: Binary prefixes      A comphrensive table of all binary multiples.	28Rp5
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