Found 2,883 abbreviations starting with SI:

SIRS

Stennis Image Retrieval System

Miscellaneous » Unclassified

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SIRS

Sons In Retirement SIR

Miscellaneous » Unclassified

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SIRS

Schizophrenia International Research Society

Academic & Science » Research

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SIRS

Southern Indiana Resource Solutions

Miscellaneous » Unclassified

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SIRS

Serials Issues Resources Series

Miscellaneous » Unclassified

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SIRS

Social Issues Resources Series

Miscellaneous » Unclassified

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SIRS

Safesite Internet Records System

Miscellaneous » Unclassified

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SIRS

Smart Indicators for Reflection Support

Miscellaneous » Unclassified

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SIRS

Systemic Immune Response Syndrome

Miscellaneous » Unclassified

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SIRS

Salary Information Retrieval System

Miscellaneous » Unclassified

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SIRS

Strategic Industry Reward Solutions

Miscellaneous » Unclassified

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SIRS

Septic Inflammatory Response System

Miscellaneous » Unclassified

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SIRT

Sierra National Bank of Tehachapi

Business » NASDAQ Symbols

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SIRT

Self-Imposed Red Tape

Business » General

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SIRT

selective internal radiation therapy

Medical » British Medicine

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SIRT

service issues resolution team

Medical » British Medicine

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SIRT

This term got 3 (!) hits on 10.11.2011, and two of those on lists of abbreviations. It is thus unlikely that it is in active use

Medical » British Medicine

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SIRTF

Space Infra-Red Telescope Facility

Governmental » NASA

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SIRU

Southern Inland Rugby Union

Community » Sports

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SIRU

Social Informatics Research Unit

Academic & Science » Research

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SIRX

Southern Illinois Railcar Company

Regional » Railroads

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SIS

Special Intelligence System

Governmental » Military

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SIS

Strategic Information System

Governmental » Military

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SIS

STOW Infrastructure System

Governmental » Military

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SIS

System Integration and Support

Governmental » Military

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