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CGS system:  centimeter, gram, second

FPS system : foot, pound, second
             foot, yard, miles...

MKS system : meter, kg, second.

SI :  System Internationale des Unites
   This is a complete set of units and used in all countries.
    meter, kg, second,  ampere for current,  degree Kelvin for temperature.
    candela is the unit for luminous intensity  of light.
    mole is the unit for amount of substance or material.

 The magnitudes of the basic units are defined in terms of standards,which are supposed to be stable and unchanging.

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