FX

FX is a two-letter combination that has multiple meanings, including:

FX Network – a cable/satellite television network
Federal Express – FX is the company's stock symbol
Abbreviation of “effects” – see special effects, sound effects
F/X – a movie set in the behind-the-scenes world of special effects. There was also a sequel, F/X2.
F/X: The Series – a television series based on the movie