| item | description | category | filter | more on... |
| PIR | Para Infantry Regiment | Governmental/Military |
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| PIR | Parents In Room | Chat and Slang |
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| PIR | Pass In Review | Governmental/Military |
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| PIR | Passive Infra Red | Governmental/Military |
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| PIR | Periodic Interest Rate | Edu./Mathematics |
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| PIR | Phoenix International Raceway | Radio Stations |
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| PIR | Pier 1 Imports, Inc. | Business/General |
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| PIR | Pierre, South Dakota USA | Regional/Airport Codes |
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| PIR | Pile Installation Recorder | Business/Products |
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| PIR | Pittsburgh Industrial Railroad Incorporated | Regional/Railroads |
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| PIR | Portland International Raceway | Radio Stations |
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| PIR | Post Implementation Review | Governmental/Military |
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| PIR | Primary Image Record | Governmental/Military |
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| PIR | Priority Information Report | IT/Security |
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| PIR | Priority Information Requirement | Governmental/Military |
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| PIR | Priority Intelligence Requirements | Governmental/Military |
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| PIR | Problem Identification Report | Governmental/Military |
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| PIR | Processor Information ROM | IT/Hardware |
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| PIR | Protein Information Resource | Medical/Human Genome |
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| PIR | Protocol Independent Routing | Uncategorized |
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