Miscellanea
- ṛc "verse" in Sanskrit
- RC Cola
- Reinforced concrete, a concrete in which reinforcement bars ("rebars") have been incorporated to strengthen the structure
- Relative clause, in linguistics, a subordinate clause that modifies a noun
- Research Chemical, a name used to refer to laboratory use & uncommon grey market psychoactive drugs
- Reserve Component, a term used in the United State military
- Revenue Commissioners, Ireland
- Reverse Circulation, a term used in drilling rig
- Ridge Connector
- Ritchey-Chrétien, a design of telescope
- Roll Call, a term used in theatre
- Roman Catholic
- Root cause
- Royal Caribbean
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