XXX - Definition and Overview

Uses of the TLA XXX:

1. As a reference to Pornography e.g. X-rated movies
2. As a reference to Amsterdam, after the city flag (this may be linked to the use of XXX in Pornography).
   

   

   Flag of of the city of Amsterdam.
3. The ISO 4217 currency code for no currency
4. The standard Morse code prefix for urgent communications (q.v. SOS)
5. xXx (movie), a 2002 action film starring Vin Diesel
6. ArXiv.org e-print archive, formerly known as xxx.lanl.gov
7. A reference to the Straight Edge lifestyle common on Tattoos
8. For the Roman numeral XXX, see 30 (number)
9. Former TNA Wrestling stable consisting of "The Fallen Angel" Christopher Daniels and "Primetime" Elix Skipper and Low Ki
10. To allude to straight edge, with the three Xs originally standing for "don't drink, don't smoke, don't fuck".

See also X, XX, XXXX.