Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym ISR is...

ISR is

Invoice Summary Register

More Meanings For ISR:

Interrupt Service Routine
Interrupt Segment Register
Interrupt Space Register
Interrupt Service Routine
Information Storage and Retrieval
Intermediate Session Routing
Integrated Switch Router
Incremental Software Release
In-Situ Rinse
Ice Sheet Reconstruction
Initial State Radiation
Institute for Sensory Research
Intercept Stabilize And Resolve
Illegal Street Racing
Illegal Street Racer

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