- 1. Microsoft Excel.
XL is a shorthand abbreviation for Microsoft Excel. XL was once encouraged by Microsoft as the standard abbreviation for Microsoft Excel.
For more information see:
- http://everything.explained.at/Microsoft_Excel/ - Microsoft Excel Explained.
- 2. Roman numeral for 40.
In Roman numerals the letters XL represent 40. X represents 10, L represents fifty, so XL represents X taken away from L (10 away from 50 = 40).