Selenium can refer to:

• Selenium, a chemical element
• Isotopes of selenium for more information on isotopic data
• Selenium-79, an isotope of selenium responsible for a high dose-to-man in radioactive waste disposal in deep clay formation. Its halflife was revised several times in the last decade and is now estimated to 295 ka.
• Selenium (software), a test tool for web applications
• Selenium (company), a loudspeaker manufacturer

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