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IDL may refer to:

IDL (programming language)

IDL, short for Interactive Data Language, is a programming language used for data analysis. It is popular in particular areas of science, such as astronomy, atmospheric physics and medical imaging. IDL shares a common syntax with PV-Wave and originated from the same codebase, though the languages have subsequently diverged in detail. There are also two free implementations, GNU Data Language (GDL) and Fawlty Language (FL).