Names of Very-Large and Infinitesimal Numbers

In 2011 we encountered very large and very small numbers that were all necessarily related, a real continuum, for our Big Board-little universe project. We asked over and over again, “What does it mean?”

In the middle of the chart, from Notations 80-to-140, were numbers with which we had worked in the past . The very small numbers, truly infinitesimals, ranged from Notations 1-to-64. The very large numbers ranged from Notations 140-202.

Primary References: Large numbers like tredecillion.

Name	Number	Group	Symbol
—	Largest-named to smallest-named	—	—
septillion	1,000,000,000,000,000,000,000,000	yotta	Y
sextillion	1,000,000,000,000,000,000,000	zetta	Z
quintillion	1,000,000,000,000,000,000	exa	E
quadrillion	1,000,000,000,000,000	peta	P
—	Numbers-names from large to small	—	—
quadrillionth	0.000 000 000 000 001	femto	f
quintillionth	0.000 000 000 000 000 001	atto	a
sextillionth	0.000 000 000 000 000 000 001	zepto	z
septillionth	0.000 000 000 000 000 000 000 001	yocto	y
(no more)	There are no official designations for smaller units.
	We have requested names from ISO and NIST.

Name	Power of 10	Decimal
Thousand	103	1,000
Million	106	1,000,000
Billion	109	1,000,000,000
Trillion	1012	1,000,000,000,000
Quadrillion	1015	American standards
Quintillion	1018
Sextillion	1021
Septillion	1024
Octillion	1027
Nonillion	1030
Decillion	1033
Undecillion	1036
Duodecillion	1039
Tredecillion	1042	42 zeros
Quattuordecillion	1045
Quindecillion	1048
Sexdecillion	1051
Septemdecillion	1054
Octodecillion	1057
Novemdecillion	1060
Vigintillion	1063	63 zeros