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IRRS abbr.
abbr.	irrigation runoff return system (julievo); Integrated Regulatory Review Service (Millie)
abbr., avia.	infra-red reconnaissance receiving system
abbr., comp., net., IT	Intelligent Remote Reboot Switch
abbr., el.	infrared reflection spectroscopy
abbr., railw.	International Rail Road Systems Incorporated
abbr., scottish	Infra-Red Reconnaissance System
abbr., silic.	infra-red reflection spectroscopy
abbr., space	IR reconnaissance system
mil.	improved reaming rates system; individual ready reserve system; infrared receiving system; infrared reconnaissance system