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

PIR is

Pittsburgh Industrial Railroad Incorporated

More Meanings For PIR:

Processor Information ROM
Priority Information Report
Parents In Room
Periodic Interest Rate
Protein Information Resource
Pier 1 Imports, Inc.
Pile Installation Recorder
Problem Identification Report
Priority Information Requirement
Priority Intelligence Requirements
Primary Image Record
Passive Infra Red
Pass In Review
Post Implementation Review
Para Infantry Regiment

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