What does RU stand for?

US Revenue Private Die Playing Card (Scott Catalogue prefix; philately)

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Rowan University (Glassboro, NJ) Royaume Uni (French: United Kingdom) Rubberized Urethane Rugby Union Russia (top level domain) Russian (linguistics) Rutgers University Ruthenium Rutherfordium Ryerson University (Toronto, Ontario, Canada)		Remote-controlled Undetectable Anti-Personnel mine (Hitman: Blood Money) Research University/High Research Activity (school classification) Research University/Very High Research Activity (school classification) Are You One To? Radioisotope Use Authorization (University of California, San Diego) Reduced Under Anesthesia Regional Utility Authority Remote User Agent Right Upper Arm Rising up Angry