An electric light is a device that produces visible light from electric current.
R-phrases (short for risk phrases) are defined in Annex III of European Union Directive 67/548/EEC: Nature of special risks attributed to dangerous substances and preparations.
The New York City Subway is a large rapid transit system and has a large fleet of rolling stock.
The R-39 Rif (NATO reporting name: SS-NX-20 Sturgeon; bilateral arms control designation: RSM-52) was a submarine-launched ballistic missile (SLBM) that served with the Soviet Navy from its introduction in 1983 until 1991, after which it served with the Russian Navy until 2004.
The R39 is a provincial route in South Africa that connects Standerton with Ermelo.