International RadioSurgery Association

Community » Non-Profit Organizations

International Rett Syndrome Association

Community » Non-Profit Organizations

Inversiones y Rentas, S.A.

Business » Firms

Irvine Sensors Corporation

Business » NASDAQ Symbols

Institut Royal des Sciences Naturelles de Belgique/ Koninklijk Belgisch Instituut voor Natuurwetenschappen

Medical » Veterinary

Infrared Search and Track

Governmental » Military

Infrared Search and Track (Capability)

Governmental » Military

Iran Standard Time

Regional » Time Zones

Infrared Search and Track Sensor

Governmental » Military

Infrared Search and Track System

Governmental » Military

Interpool/Rail Services Limited

Regional » Railroads

I R T Property Company

Business » NYSE Symbols

Identification Referral And Tracking

Miscellaneous » Unclassified

Identification Referral Tracking

Miscellaneous » Unclassified

Immigration Review Tribunal

Governmental » US Government

ImmunoReactive Trypsin

Medical » Laboratory

In Real Time

Computing » General

Incident Response Team

Community » Law

Independent Review Team

Governmental » Military

Infared Retaining Technology

Miscellaneous » Unclassified

Infinity Radiance Trance

Miscellaneous » Unclassified

Initial Response Team

Governmental » Military

Integrated Retail Terminal

Miscellaneous » USPS

Interborough Rapid Tran

Miscellaneous » Unclassified

Interborough Rapid Transi

Miscellaneous » Unclassified