XXX - a type of X rating applied to some pornographic films

Apart from the obvious may also mean any of the following:
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.xxx - a top-level domain intended as a voluntary option for sexually explicit sites on the Internet
XXX - an indication of urgency in radio communication, less urgent than SOS
XXX - a comment to warn other programmers of problematic or misleading code
XXX - the code for "no currency" in ISO 4217
XXX - the code for "unspecified nationality" on a machine-readable passport
XXX - the number 30 in Roman numerals
xXx - a 2002 action film starring Vin Diesel
xXx - State of the Union, the 2005 sequel starring Ice Cube
xXx - The Return of Xander Cage, a planned sequel of xXx starring Vin Diesel
XXX - (ZZ Top album), a 1999 album by the rock band ZZ Top
XXX - (Danny Brown album), a 2011 album by rapper Danny Brown
XXX - (Asia album), a 2012 album by the band Asia
XXX - a 2011 single by Japanese band L'Arc en Ciel
XXX - Exklusibong, Explosibong, Exposé, a Philippine current affairs television show
XXX - Anya Amasova or Agent XXX, a character in the James Bond franchise
XXX - a shortened version of "XXXL", a plus size clothing size
XXX - triple X syndrome chromosomal variation, often referred to as 47,XXX
XXX - Triple X (professional wrestling), a former wrestling stable in Total Nonstop Action Wrestling
XXX - Triple X Wrestling, a professional wrestling promotion, based in Coventry, U.K.
XXX - Tripe X ESPN Radio, a trio of sports radio stations in the Washington, D.C. area
XXX - Triple X Records of Los Angeles
WXXX - a radio station in Vermont known as "95 Triple X"
XXX - Triple X, the code name of ghost prisoner Hiwa Abdul Rahman Rashul
XXX - Triple X, an anime studio
XXX - Triple X, a strong beer made by Molson
XXX - Triple X, the nickname of the XXX Corps (Pakistan) based out of Gujranwala, Pakistan
XXX - Triple XXX root beer