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f(x) (Korean: 에프엑스; pronounced /ˌɛf ˈɛks/) is a South Korean girl group formed by SM Entertainment in 2009. The name is a play on the mathematical notation for function, with "f" signifying "flower" and "x" representing the female's double X chromosome. The quintet consists of Victoria, Amber, Luna, Sulli, and Krystal.