yotta-

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yotta- (symbol Y) is an SI prefix in the SI (system of units) denoting 10²⁴ or 1 000 000 000 000 000 000 000 000.

Adopted in 1991, it comes from the Greek á½€ÎºÏ„ÏŽ (oktÃ³), meaning eight, because it is equal to 1000⁸.

As of 2008, yotta- is the largest and last SI prefix to be confirmed.

Examples:

the mass of the Earth is 5973.6 Yg the total power output of the Sun is 383 YW the total storage capacity produced by humans each year is expected to surpass 1 YB by 2013 ^[1] the universe is estimated to be 880 Ym in diameter

SI prefixes

1000^m 10ⁿ Prefix Symbol Since^[1] Short scale Long scale Decimal

1000⁸ 10²⁴ yotta- Y 1991 Septillion Quadrillion 1 000 000 000 000 000 000 000 000

1000⁷ 10²¹ zetta- Z 1991 Sextillion Trilliard 1 000 000 000 000 000 000 000

1000⁶ 10¹⁸ exa- E 1975 Quintillion Trillion 1 000 000 000 000 000 000

1000⁵ 10¹⁵ peta- P 1975 Quadrillion Billiard 1 000 000 000 000 000

1000⁴ 10¹² tera- T 1960 Trillion Billion 1 000 000 000 000

1000³ 10⁹ giga- G 1960 Billion Milliard 1 000 000 000

1000² 10⁶ mega- M 1960 Million 1 000 000

1000¹ 10³ kilo- k 1795 Thousand 1 000

1000^2/3 10² hecto- h 1795 Hundred 100

1000^1/3 10¹ deca- da 1795 Ten 10

1000⁰ 10⁰ (none) (none) NA One 1

1000^âˆ’1/3 10^âˆ’1 deci- d 1795 Tenth 0.1

1000^âˆ’2/3 10^âˆ’2 centi- c 1795 Hundredth 0.01

1000^âˆ’1 10^âˆ’3 milli- m 1795 Thousandth 0.001

1000^âˆ’2 10^âˆ’6 micro- Âµ 1960^[2] Millionth 0.000 001

1000^âˆ’3 10^âˆ’9 nano- n 1960 Billionth Milliardth 0.000 000 001

1000^âˆ’4 10^âˆ’12 pico- p 1960 Trillionth Billionth 0.000 000 000 001

1000^âˆ’5 10^âˆ’15 femto- f 1964 Quadrillionth Billiardth 0.000 000 000 000 001

1000^âˆ’6 10^âˆ’18 atto- a 1964 Quintillionth Trillionth 0.000 000 000 000 000 001

1000^âˆ’7 10^âˆ’21 zepto- z 1991 Sextillionth Trilliardth 0.000 000 000 000 000 000 001

1000^âˆ’8 10^âˆ’24 yocto- y 1991 Septillionth Quadrillionth 0.000 000 000 000 000 000 000 001

The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM. The 1948 recognition of the micron by the CGPM was abrogated in 1967.