IDL

IDL may mean:

General

International Date Line, the time zone date boundary
Intermediate density lipoprotein
John F. Kennedy International Airport, from when it was named "Idlewild Airport" ("IDL" IATA airport code)
International Drivers License
International Darts League, a defunct major darts tournament
IDL Drug Stores, a now-defunct independent drug store cooperative

Computer Science

Interface description language, any computer language used to describe a software component's interface
- IDL specification language, the original IDL created by Lamb, Wulf and Nestor at Queen's University, Canada
- OMG IDL, an IDL standardized by Object Management Group and implemented in CORBA for DCE/RPC services, also selected by the W3C for exposing the DOM of XML, HTML, CSS, and SVG documents.
- Microsoft Interface Definition Language, an extension of OMG IDL for supporting Microsoft's DCOM services
IDL (programming language) (Interactive Data Language), a data analysis language popular for science applications
ICAD Design Language, a knowledge-based engineering language

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