The number 30 in Roman numerals
Especially applied to a year AD or Olympiad (or, by extension, another sporting event) - as in
The year 30 AD
Games of the XXX Olympiad, the 2012Summer Olympic Games in London, England
Super Bowl XXX, held on January 28, 1996
A mark indicating "extra strong"
Especially applied to:
Traditionally applied by brewers tobarrels of full-strength beer
A designation for an alcohol concentration in moonshine, sometimes used as a generic depiction of distilled spirits
An identifier for pornography,especially X-rated movies
.xxx, an approved top-level domain intended as a voluntary option for sexually explicit sites on the Internet
Mommy XXX, a porn reality show featuring Demi Delia
Other items,products supposed to be especially strong or effective
A brand of laundry soap in India
A warning or danger signal
An indication of urgency in radio communication, less urgent than SOS
Incomputer programming, XXX is a comment to warn other programmers of problematic or misleading code
xxx (usually lower case), as often used at the bottom of affectionate letters or emails
Three kisses,three loving words I love you (each denoted by an x, often used with 'o' to mean a hug: e.g. xox, oxo).
The number 666 in Pythagorean numerology
xXx, a 2002 action film starring Vin DieselxXx: State of the Union, the 2005 sequel starring Ice Cube
xXx: The Return of Xander Cage, the 2011 sequel of xXx starring Vin Diesel
XXX (album), a 1999 album by the rock band ZZ Top
XXX:Exklusibong, Explosibong, Exposé, a Philippine current affairs television show
XXX, the ISO 4217 currency code for "no currency"
ArXiv.org e-print archive, formerly known as xxx.lanl.gov
XXX Cantos, a poemby Ezra Pound
A symbol of the straight edge lifestyle
A shortened version of "XXXL", a plus size clothing size
A reference to Amsterdam, after the three crosses on the Coat of arms of Amsterdam...