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 ὀκτώ (októ), 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
  • a yottabyte of storage per year by 2013
SI prefixes
1000m 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
10002/3 102 hecto- h 1795 Hundred 100
10001/3 101 deca- da 1795 Ten 10
10000 100 (none) (none) NA One 1
1000−1/3 10−1 deci- d 1795 Tenth 0.1
1000−2/3 10−2 centi- c 1795 Hundredth 0.01
1000−1 10−3 milli- m 1795 Thousandth 0.001
1000−2 10−6 micro- µ 1960[2] Millionth 0.000 001
1000−3 10−9 nano- n 1960 Billionth Milliardth 0.000 000 001
1000−4 10−12 pico- p 1960 Trillionth Billionth 0.000 000 000 001
1000−5 10−15 femto- f 1964 Quadrillionth Billiardth 0.000 000 000 000 001
1000−6 10−18 atto- a 1964 Quintillionth Trillionth 0.000 000 000 000 000 001
1000−7 10−21 zepto- z 1991 Sextillionth Trilliardth 0.000 000 000 000 000 000 001
1000−8 10−24 yocto- y 1991 Septillionth Quadrillionth 0.000 000 000 000 000 000 000 001
  1. The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.
  2. The 1948 recognition of the micron by the CGPM was abrogated in 1967.

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