Simon Cowell's "The X Factor" is the latest TV program to use the mysterious, vaguely ominous-sounding 24th letter in its title. Here are five others:

The X-Files (1993-2002). Spooky series in which two stalwart FBI agents (David Duchovny, Gillian Anderson) searched for The Truth . . . which was out there.

The X Games (1995-). Annual summer and winter action sports competition created by ESPN.

The X Show (1999- 2001). Male-oriented late-night talk show on FX

XFL (2001). Short-lived, made-for-TV pro football league created by wrestling impresario Vince McMahon.

The X-Men (2011). The newest TV incarnation of the Marvel superheroes debuted this past Friday night on G4.

On the latest episode of "Sarra Sounds Off," we look at East Islip baseball's inspirational comeback story, Jared Valluzzi has the plays of the week and Tess Ferguson breaks down the top defensive players in girls lacrosse. 

Sarra Sounds Off Ep. 35: EI baseball, girls lacrosse and plays of the week On the latest episode of "Sarra Sounds Off," we look at East Islip baseball's inspirational comeback story, Jared Valluzzi has the plays of the week and Tess Ferguson breaks down the top defensive players in girls lacrosse.

On the latest episode of "Sarra Sounds Off," we look at East Islip baseball's inspirational comeback story, Jared Valluzzi has the plays of the week and Tess Ferguson breaks down the top defensive players in girls lacrosse. 

Sarra Sounds Off Ep. 35: EI baseball, girls lacrosse and plays of the week On the latest episode of "Sarra Sounds Off," we look at East Islip baseball's inspirational comeback story, Jared Valluzzi has the plays of the week and Tess Ferguson breaks down the top defensive players in girls lacrosse.

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