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Information, Storage and Retrieval

Initial State Radiation, in particle physics

Israir summary and related information.

ISR is a three-letter abbreviation with multiple meanings, including:

Interrupt Service Routine, a software routine that is executed in response to an interrupt

International Socialist Review U.S Socialist magazine.

International Star Registry

In-Stent Restenosis, renewed blockage of a blood vessel after a stent has been implanted.

Information Systems Research, an academic journal in the information systems discipline.

Incoherent scatter Radar, a ground-based technique for studying the ionosphere.

Institutional and Scientific Relations Directorate (European Union)

Intelligence, Surveillance and Reconnaissance in a military context (See ISTAR)

International Search Report (in patent law)

In-Service Register or Interrupt Service Register. In computer science, a register used to indicate which interrupts are in progress.

Intersecting Storage Rings, a particle collider at CERN