What does XA stand for?

What does XA mean?

XA	The Sims - Electronic Arts Computing » File Extensions
XA	eXtended Architecture Computing » Hardware
XA	Chi Alpha Business » Firms
XA	Experiential Agency Business » Firms
XA	Chi Alpha Campus Ministries Community » Religion
XA	Xtreme Arena Community » Sports
XA	Xtreme Assassins Community » Sports
XA	Xtreme Accuracy Computing » Assembly
XA	Xopen Architecture Computing » Hardware
XA	Xtremely Awesome Community » Media
XA	Experimental Agency Governmental » US Government
XA	Xtreem Anarchy Miscellaneous » Science Fiction
XA	CD-ROM extended architecture Computing » Software
XA	CD-ROM extended architecture Computing » Drivers
XA	CD-ROM extended architecture Community » Media