Metric prefixes for your reference only :

Metric prefixes
PrefixSymbol1000m10nDecimalEnglish word[n 1]Since[n 2]
yottaY 1000810241000000000000000000000000septillion1991
zettaZ 1000710211000000000000000000000sextillion1991
exaE 1000610181000000000000000000quintillion1975
petaP 1000510151000000000000000quadrillion1975
teraT 1000410121000000000000trillion1960
gigaG 100031091000000000billion1960
megaM 100021061000000million1960
kilok 100011031000thousand1795
hectoh 10002/3102100hundred1795
decada 10001/310110ten1795

100001001one
decid 1000−1/310−10.1tenth1795
centic 1000−2/310−20.01hundredth1795
millim 1000−110−30.001thousandth1795
microμ 1000−210−60.000001millionth1960
nanon 1000−310−90.000000001billionth1960
picop 1000−410−120.000000000001trillionth1960
femtof 1000−510−150.000000000000001quadrillionth1964
attoa 1000−610−180.000000000000000001quintillionth1964
zeptoz 1000−710−210.000000000000000000001sextillionth1991
yoctoy 1000−810−240.000000000000000000000001septillionth1991
  1. ^This table uses the short scale.

  2. ^The metric system was introduced in 1795 with six prefixes. The other dates relate to recognition by a resolution of the CGPM.