Yotta-

Yotta is the largest decimal unit prefix in the metric system, denoting a factor of 10²⁴ (1000000000000000000000000), or one septillion. It has the symbol Y. The prefix name is derived from the Latin octo^[1] or the Ancient Greek ὀκτώ (oktṓ), meaning eight, because it is equal to 1000⁸. It was added as an SI prefix to the International System of Units (SI) in 1991.^[2]

Usage examples

The mass of the Earth is 5,972.6 yottagrams (2.1068×10²⁶ oz).^[3]
The mass of the oceans is about 1.4 yottagrams (4.9×10²² oz).^[4]
The total power output of the Sun is approximately 385 yottawatts (5.16×10²³ hp).^[5]
The observable universe is estimated to be 880 yottametres (5.5×10²³ mi) in diameter.^[6]
One yottabyte (YB) is a unit of digital information or information storage capacity for one septillion bytes or 1000 zettabytes. The yobibyte (YiB) is a related unit that uses a binary prefix and means 1024⁸ bytes, which is approximately 1.2 septillion bytes.

SI prefixes
v
t
e
Prefix		Base 10	Decimal	English word		Adoption^{[nb 1]}
Name	Symbol	Base 10	Decimal	Short scale	Long scale	Adoption^{[nb 1]}
yotta	Y	10²⁴	1000000000000000000000000	septillion	quadrillion	1991
zetta	Z	10²¹	1000000000000000000000	sextillion	trilliard	1991
exa	E	10¹⁸	1000000000000000000	quintillion	trillion	1975
peta	P	10¹⁵	1000000000000000	quadrillion	billiard	1975
tera	T	10¹²	1000000000000	trillion	billion	1960
giga	G	10⁹	1000000000	billion	milliard	1960
mega	M	10⁶	1000000	million		1873
kilo	k	10³	1000	thousand		1795
hecto	h	10²	100	hundred		1795
deca	da	10¹	10	ten		1795
		10⁰	1	one		–
deci	d	10⁻¹	0.1	tenth		1795
centi	c	10⁻²	0.01	hundredth		1795
milli	m	10⁻³	0.001	thousandth		1795
micro	μ	10⁻⁶	0.000001	millionth		1873
nano	n	10⁻⁹	0.000000001	billionth	milliardth	1960
pico	p	10⁻¹²	0.000000000001	trillionth	billionth	1960
femto	f	10⁻¹⁵	0.000000000000001	quadrillionth	billiardth	1964
atto	a	10⁻¹⁸	0.000000000000000001	quintillionth	trillionth	1964
zepto	z	10⁻²¹	0.000000000000000000001	sextillionth	trilliardth	1991
yocto	y	10⁻²⁴	0.000000000000000000000001	septillionth	quadrillionth	1991
^ Prefixes adopted before 1960 already existed before SI. The introduction of the CGS system was in 1873.

^ Proceedings of the 19th CGPM (1991), page 80 (french) and page 168 (english). Retrieved 2022-10-31
^ "Resolution 4 of the 19th CGPM (Conférence Générale des Poids et Mesures)". BIPM (Bureau International des Poids et Mesures).
^ Williams, David R. "Earth fact sheet". Earth fact sheet. NASA. Retrieved 31 October 2015.
^ Kennish, Michael J. (2001). Practical handbook of marine science. Marine science series (3rd ed.). CRC Press. p. 35. ISBN 0-8493-2391-6.
^ "WolframAlpha: the Sun's total power output in yottawatts".
^ "WolframAlpha: size of universe in yottameters".