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SPEAR (originally Stanford Positron Electron Asymmetric Ring, now simply a name) is a collider at the Stanford Linear Accelerator Center. It began running in 1972, colliding electrons and positrons with an energy of 3 GeV. During the 1970s, experiments at the accelerator played a key role in particle physics research, including the discovery of the J/ψ particle and other charmonium states and the discovery of the tau lepton. Today, SPEAR is used as a synchrotron radiation source for the Stanford Synchrotron Radiation Laboratory. References * Brief explanation of the acronym in SLACspeak Retrieved from "http://en.wikipedia.org/" 
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