ISI can refer to several different things, depending on the context. Here are some possible meanings:
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Inter-Services Intelligence: This is the largest and best-known component of the Pakistani intelligence community. It is responsible for gathering, processing, and analyzing any information from around the world that is deemed relevant to Pakistans national security.
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Import Substitution Industrialization: This is an economic theory typically adhered to by developing countries or emerging market nations that wish to decrease their dependence on developed countries. ISI targets the protection and incubation of newly formed domestic industries to fully develop sectors so the goods produced are competitive with imported goods.
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Institute for Scientific Information: This was an academic publishing service that offered scientometric and bibliographic database services. ISI maintained citation databases covering thousands of academic journals, including a continuation of its longtime print-based indexing service the Science Citation Index (SCI), as well as the Social Sciences Citation Index (SSCI) and the Arts and Humanities Citation Index (AHCI).
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Pakistan intelligence agency: ISI can also refer to the Pakistan intelligence agency, which is a powerful and almost autonomous political and military force. It has procured nuclear technology and delivery capabilities.
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iSi Cooking Tool: This is a pressurized canister that uses gas to create foams and whips. It is used in cooking and food preparation.
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International Statistical Institute: This is an independent international statistical organization that sets the global standard for ethical practice in statistics. It has associations, committees, and members from over 150 countries and regions.
Without additional context, it is impossible to determine which of these meanings is intended.