0.000,000,000,000,000,000,000,001 = yocto
0.000,000,000,000,000,000,001 = zepto
0.000,000,000,000,000,001 = atto
0.000,000,000,000,001 = femto
0.000,000,000,001 = pico
0.000,000,001 = nano
0.000,001 = micro
0.001 = milli
0.01 = centi
0.1 = deci
1 = (none)
10 = deca
100 = hecto
1,000 = kilo
1,000,000 = mega
1,000,000,000 = giga
1,000,000,000,000 = tera
1,000,000,000,000,000 = peta
1,000,000,000,000,000,000 = exa
1,000,000,000,000,000,000,000 = zetta
1,000,000,000,000,000,000,000,000 = yotta
1,000,000,000,000,000,000,000,000,000 = unnamed
1,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,
000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,0000 = googol
Note: An ångström is equal to 0.1 nanometers. The ångström is still commonly used but it is not part of the official International System of Units (SI). Today the use of the ångström as a unit is less popular than it used to be, and the nanometer is often used instead. The use of the ångström is officially discouraged by the International Committee for Weights and Measures.