pico-

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This article describes the SI prefix. For other meanings, see Pico.
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pico- (symbol p) is a prefix denoting a factor of 10-12 in the International System of Units (SI).

From the Italian piccolo (small),[1] it was confirmed in 1960 when the SI was established.[2]

SI prefixes
1000n 10n Prefix Symbol Short scale Long scale Decimal equivalent in SI writing style
10008 1024 yotta- Y Septillion Quadrillion 1 000 000 000 000 000 000 000 000
10007 1021 zetta- Z Sextillion Trilliard (thousand trillion) 1 000 000 000 000 000 000 000
10006 1018 exa- E Quintillion Trillion 1 000 000 000 000 000 000
10005 1015 peta- P Quadrillion Billiard (thousand billion) 1 000 000 000 000 000
10004 1012 tera- T Trillion Billion 1 000 000 000 000
10003 109 giga- G Billion Milliard (thousand million) 1 000 000 000
10002 106 mega- M Million 1 000 000
10001 103 kilo- k Thousand 1 000
10002/3 102 hecto- h Hundred 100
10001/3 101 deca- da Ten 10
10000 100 (none) (none) One 1
1000−1/3 10−1 deci- d Tenth 0.1
1000−2/3 10−2 centi- c Hundredth 0.01
1000−1 10−3 milli- m Thousandth 0.001
1000−2 10−6 micro- µ Millionth 0.000 001
1000−3 10−9 nano- n Billionth Milliardth 0.000 000 001
1000−4 10−12 pico- p Trillionth Billionth 0.000 000 000 001
1000−5 10−15 femto- f Quadrillionth Billiardth 0.000 000 000 000 001
1000−6 10−18 atto- a Quintillionth Trillionth 0.000 000 000 000 000 001
1000−7 10−21 zepto- z Sextillionth Trilliardth 0.000 000 000 000 000 000 001
1000−8 10−24 yocto- y Septillionth Quadrillionth 0.000 000 000 000 000 000 000 001