1st_ ISI is the IATA code for Isisford Airport (Queensland, Australia). 2nd_ Acronym for "Industrialization by Import Substitution", a mechanism for industrial development used by primary economy countries by encouraging the manufacture of locally manufactured products and taxing imports. 3o_ Stands for InterSymbol Interference, a distortion in the telecommunications signal (especially digital) by overlapping or deleting data that confuses reception.
ISI is the abbreviation for an economic model very implemented in Latin America. It's basically "Industrialization to replace imports." It is a model implemented to develop local or national industry. generate sources of employment and prevent foreign exchange leakage (which would be generated by imports of consumer goods).