Orders of magnitude (numbers)

This list contains selected positive numbers in increasing order, including counts of things, dimensionless quantity and probabilities. Each number is given a name in the short scale, which is used in English-speaking countries, as well as a name in the long scale, which is used in some of the countries that do not have English as their national language. This list contains selected positive numbers in increasing order, including counts of things, dimensionless quantity and probabilities. Each number is given a name in the short scale, which is used in English-speaking countries, as well as a name in the long scale, which is used in some of the countries that do not have English as their national language. (0.000000000000000000000000000001; 1000−10; short scale: one nonillionth; long scale: one quintillionth) (0.000000000000000000000000001; 1000−9; short scale: one octillionth; long scale: one quadrilliardth) (0.000000000000000000000001; 1000−8; short scale: one septillionth; long scale: one quadrillionth) ISO: yocto- (y) (0.000000000000000000001; 1000−7; short scale: one sextillionth; long scale: one trilliardth) ISO: zepto- (z) (0.000000000000000001; 1000−6; short scale: one quintillionth; long scale: one trillionth) ISO: atto- (a)