The X.Org project provides an open source implementation of the X Window System. The development work is being done in conjunction with the freedesktop.org community.
http://www.x.org/

X is the twenty-fourth letter in the modern Latin alphabet. Its name in English is spelled ex or occasionally ecks (pronounced /?ks/), plural exes (pronounced /?ks?z/).
http://en.wikipedia.org/wiki/X

X is an American punk rock band, formed in Los Angeles in 1977. [1] While they achieved only limited mainstream success, they were widely considered one of the most influential ...
http://en.wikipedia.org/wiki/X_(U.S._band)

Incidentally, we also made this Labs site available through www.x.com as a way of paying homage to PayPal?s innovative roots. Confinity and X.com merged in 2000 to form the ...
http://www.x.com/

Leopard collects hundreds of features into one OS so innovative, it will completely transform your Mac. A dramatic new desktop. One-click data time travel. The power to see inside ...
http://www.apple.com/macosx/