Yotta-

Yotta is the largest unit prefix in the International System of Units (SI), denoting a factor of 10²⁴ or 1000000000000000000000000. It has the unit symbol Y.

The prefix name is derived from the Greek οκτώ (októ), meaning eight, because it is equal to 1000⁸. It was added to the SI in 1991.

Before the official adoption of the yotta prefix, the multiple was also known as otta.^{[citation needed]}

Usage examples:

• The mass of the Earth is 5973.6 Yg or 5.9736 Zt.
• The mass of the oceans is about 1.4 Yg.
• The mass of the Moon is approximately 73.49 Yg.
• The total power output of the Sun is approximately 385 YW.
• The observable universe is estimated to be 880 Ym in diameter.
• One yottabyte is a unit of information or computer storage equal to one septillion bytes.

Metric prefixes

Prefix Symbol 1000m 10n Decimal English word Since yotta Y  10008  1024 1000000000000000000000000 septillion 1991 zetta Z  10007  1021 1000000000000000000000 sextillion 1991 exa E  10006  1018 1000000000000000000 quintillion 1975 peta P  10005  1015 1000000000000000 quadrillion 1975 tera T  10004  1012 1000000000000 trillion 1960 giga G  10003  109 1000000000 billion 1960 mega M  10002  106 1000000 million 1960 kilo k  10001  103 1000 thousand 1795 hecto h  10002/3  102 100 hundred 1795 deca da  10001/3  101 10 ten 1795  10000  100 1 one – deci d  1000−1/3  10−1 0.1 tenth 1795 centi c  1000−2/3   10−2 0.01 hundredth 1795 milli m  1000−1  10−3 0.001 thousandth 1795 micro µ  1000−2  10−6 0.000001 millionth 1960 nano n  1000−3  10−9 0.000000001 billionth 1960 pico p  1000−4  10−12 0.000000000001 trillionth 1960 femto f  1000−5  10−15 0.000000000000001 quadrillionth 1964 atto a  1000−6  10−18 0.000000000000000001 quintillionth 1964 zepto z  1000−7  10−21 0.000000000000000000001 sextillionth 1991 yocto y  1000−8  10−24  0.000000000000000000000001 septillionth 1991

See also

• Metric system
• Binary prefix
• Googol

External links

• BIPM website