firstly there are lack of standardization,i.e,countries compute their national income differently.
secondly different needs,tastes and consumption patterns of different countries
thirdly Exchange rate,i.e, different currencies to compute national income
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the international system of units is based on units of 10 and has 3 main standards, the meter, liter, and gram.
wikipedia lists some of them under "Notation in probability and statistics". However, various academic disciplines have their own publication standards also. For example, if you were publishing in the field of psychology then you might be obliged to use the APA abbreviations.
It is the SI system, abbreviated from the French Système international d'unités.
means EIA standards
ISO/IEC JTC1/SC22/WG21(That's not gibberish, it is the name of the International Standards Organisation committee which is responsible for defining the C++ programming language) Or, more exactly: Bjarne Stroustrup