What does XLS stand for?

What does XLS mean?

XLS	Excimer Laser System Medical » Oncology
XLS	Excimer Laser System Medical » Physiology
XLS	Excimer Laser System Academic & Science » Electronics
XLS	Exelis Inc. Business » NYSE Symbols
XLS	Extended Light Scatterer Academic & Science » Electronics
XLS	Microsoft Excel Spreadsheet Computing » File Extensions
XLS	Microsoft Works Spreadsheet Computing » File Extensions
XLS	St. Louis, Senegal Regional » Countries
XLS	Xenon Light Source Academic & Science » Physics
XLS	Xenon Light Source Academic & Science » Chemistry
XLS	Xtra Long Stroke Business » International Business