f(x) (Korean: 에프엑스; pronounced /ˌɛf ˈɛks/) is a South Korean girl band formed by SM Entertainment. The group made their debut on September 1, 2009.

The members are:
- Victoria (Leader, Lead Dancer)
- Amber (Main Rapper)
- Luna (Lead Vocal, Main Dancer)
- Sulli (Vocal, Rapper)
- Krystal (Maknae, Main Singer, Main Dancer)
A : Ugh, I don't get this whole f(x) thingy.. (Looking at the math book)
B : What? how come you don't get them?! F(x) is like one of the hottest girl groups from South Korea!
A : Eh?
by affxtionate June 20, 2011

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