Popular Revolutionary Army (Spanish: Ejército Popular Revolucionario), a leftist guerrilla movement in Mexico
Science and technology
EPR paradox (Einstein–Podolsky–Rosen paradox), a topic in quantum physics and the philosophy of science concerning the measurement and description of microscopic systems
Earth potential rise, the occurrence of a large current flowing to earth through an earth grid impedance
East Pacific Rise, a mid-oceanic ridge, a divergent tectonic plate boundary located along the floor of the Pacific Ocean
Electron paramagnetic resonance spectroscopy, a technique for studying chemical species that have one or more unpaired electrons
Engine pressure ratio, a ratio of pressure used in gas turbine engine monitoring and control
Yevpatoria RT-70 radio telescope (Evpatoria planetary radar), a planetary radar at the Center for Deep Space Communications, Yevpatoria, Crimea, Ukraine
Endpoint Reference, an XML structure encapsulating information useful for addressing a message to a Web service
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