Metric prefix is a decimal magnitude indicator attached before the metric unit. * yotta Y 1024 quadrillion * zetta Z 1021 trilliard * exa E 1018 trillion * peta P 1015 billiard * tera T 1012 billion * giga G 109 milliard * mega M 106 million * myria ma 104 myriad * kilo k 103 thousand * hecto h 102 hundred * deca da 101 ten * deci d 10-1 tenth * centi c 10-2 hundredth * milli m 10-3 thousandth * myrio mo 10-4 myriadth * micro µ 10-6 millionth * nano n 10-9 milliardth * pico p 10-12 billionth * femto f 10-15 billiardth * atto a 10-18 trillionth * zepto z 10-21 trilliardth * yocto y 10-24 quadrillionth