A measure of the dispersion of a distribution,calculated as the ratio of particle size below which 84% of the particles occur to the particle size below which 50% occur,in a log-normal distribution is termed

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Count mode: Most frequently occurring particle size in the distribution.
Count median diameter (CMD): Particle size above and below which 50% of the particles are found (i.e. ,the size that evenly divides the number of particles in the distribution).
Mass median diameter (MMD)or mass median aerodynamic diameter (MMAD): Particle size above and below which 50% of the mass of the particles are found (i.e. ,the size that evenly divides the mass of the particles in the distribution).
Geometric standard deviation (GSD): Measure of the dispersion of a distribution (i.e. ,the scattering of values from the average),calculated as the ratio of particle size below which 84% of the particles occur to the particle size below which 50% occur,in a log-normal distribution.This ratio determines how spread out the particles are in relationship to their size.

A Measure of the Dispersion of a Distribution,calculated as the Ratio