What does RIO stand for?

Random Insanity Online (website)

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Resident Inspector of Naval Material (US Navy) Resident Naval Inspector of Ordnance (US Navy) Radiation Intelligence Recovery Interpreter Réseau International de Néologie et de Terminologie (French: International Network for Terminology and Neology) Radiotherapy-Induced Nausea and Vomiting (oncology) Retinal Inner Nuclear Layer Homeobox Rose Introducers of New Zealand Radar Intercept Officer Random Early Discard with In/Out (algorithm)		RapidIO (Interconnect Architecture) Realistic Input/Output Opportunity Reconfigurable Input/Output Reference Interconnection Offer Régie des Installations Olympiques Regionaal Indicatie Orgaan (Dutch: Regional Indication Body; health care) Regional Information Officer (USACE) Regional Inspection Officer (India) Reintegration of Offenders Relevé d'Identité d'Opérateur (French: Statement of Identity Operator)