Inertial Reference Unit
Indefeasible Right of Use
IVA Replacement Unit
Inflight Refill Unit
Chabahar Airlines
Immune Recovery Uveitis
Implementation Review Unit
Indefeasible Rights of Use
industrial rehabilitation unit
Inertial Reference Units
Information Research Unit
Initial Review Unit
Innovative Research Universities
Integrated Recovery Utility
interferon reference unit
Internal Reference Unit
International Radium Unit
International Raiffeisen Union
International Reference Unit
International Reform University
Isolation Review Unit
item reporting units
IVA Replaceable Unit