Metric prefixes

Metric prefixes for your reference only :

Metric prefixes

Prefix Symbol 1000m 10n Decimal English word[n 1] Since[n 2] 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 ^This table uses the short scale. ^The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.