Other contributors have said "Differentiate ancient system measurement andand medieval system of measurement?" is the same question as "What is ancient measurement system?" If you believe that these are not asking the same thing and should be answered differently, click here
Imperial measurement is omplicated, inconsistent and generally difficult to use.
For example, how many inches - or feet, or yards, or furlongs and so on in a mile?
Now have a look at how many...
I know only a few but anyway here they are: ~systeme internationale (in plain English, the INTERNATIONAL SYSTEM) ~English system ~ metric system (which is also part of the international system)