From Wikipedia, the free encyclopedia
- the Rhein-Ruhr-Marathon
- the Verkehrsverbund Rhein-Ruhr
- the Rhein-Ruhr S-Bahn
- the RheinRuhrZentrum - RRZ
- RR Rhine Ruhr (PTY) Ltd, an Australian engineering firm
- RRI Rhein Ruhr International GmbH, a German engineering firm
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