Inter-boro Rapid Transit - subdivision A of the New York City Transit Authority (NYCTA) subway system.

NYC subway division called Interborough Rapid Transit. Includes 1, 2, 3, 4, 5, 6, 7, 9 subway lines.

Immunoreactive trypsinogen

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The Immigration Review Tribunal.

Instant Response Team

Inadvertent reactor trip

Infrared thermal

Thermal Research Reactor (Russian Acronym)

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An abbreviation for Interrogator-Responsor-transpondor, when all are combined in a single unit. An IRT system is an IFF device.

Identification Referral & Tracking. Former name for ISA.

Identification, referral and tracking

interstitial radiation therapy. A procedure in which radioactive material sealed in needles, seeds, wires, or catheters is placed directly into or near a tumor. Also called brachytherapy, internal radiation, or implant radiation.

see Integrated Retail Terminals.

Integrated Receiver Transcoder. Used to receive digital-format satellite signals and convert them from one type of digital format to another. The IRT receives the digitally encoded signal from the satellite dish and processes it to change the digital modulation scheme to one that can be used in the broadband network.

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Information Resources and Technologies -- technical division at the University of St. Thomas

An Instructional Resource Teacher that assists teachers with the resources related to all areas of curriculum.

A train line in NY that had many burners because its cars were all flats.

Instrument Rating Test