What does RIS stand for?

Radar Interrogator Set (associated with joint surveillance system)

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Rhode Island Resource Recovery Corporation Railroad Inspection Reporting System Random Insertion of Redundant Symbols Regulatory Information Retrieval System (National Association of Insurance Commissioners) Retrograde Intrarenal Stone Surgery (treatment of kidney stones) Rhode Island Rose Society Reviews in Religion and Theology (journal) Rolnictwa I Rozwoju Wsi (Polish: Agriculture and Rural Development) Raba Interneta v Sloveniji (Slovenian: Internet Research in Slovenia) Radar Integration System		Radio Investigation Service Radiology Information System Rail Interface System Rail Interface System (accessory mount on guns) Random Interleaved Sampling Range Instrumentation System Rannsóknagagnasafn Íslands (Icelandic: Research Bank; database) Raumbezogenes Informationssystem (German: Spacereferred information systems) Readiness Information System Received in Swap