RER

In France • , or , the commuter rail service serving Paris and its suburbs In Belgium • ('Brussels Regional Express Network'), the commuter rail service serving Brussels and its suburbs and commuters • ('Ghent Regional Express Network'), the commuter rail service serving Ghent and its suburbs and commuters In Switzerland • , the name used for the Bern S-Bahn in French speaking areas. • , now called , commuter rail service serving Geneva, Annemasse and its suburbs • , commuter rail service serving Fribourg and its suburbs • , commuter rail service serving the canton of Jura • , the name used for the Basel S-Bahn in French speaking areas. • , commuter rail service serving Vaud and its suburbs In Argentina • , a planned commuter rail service in Buenos Aires In Canada • GO Regional Express Rail, now known as GO Expansion, a planned commuter rail service in Toronto and its suburbs ==Other uses==

• Rebuilt Reading electric multiple units • The Real Estate Roundtable, a non-profit public policy organization that represents the interests of real estate • Real exchange rate, the purchasing power of a currency relative to another at current exchange rates and prices • RēR, the standard abbreviation for the label Recommended Records • Resident Evil: Revelations, 2012 video game • Resident Evil Requiem, 2026 video game • Respiratory exchange ratio, the ratio between the amount of carbon dioxide produced in metabolism and oxygen used • Rough endoplasmic reticulum, a type of endoplasmic reticulum protein-manufacturing ribosomes