Since 1998, the Casia Corporation Holland have been working on The Definitive TLA Wörterbuch to help people find their way in the ever growing intellectual chaos caused by the late-twentieth century tendency to use as many acronyms in daily communication as possible. Especially acronyms with a length of three letters have been and continue to be immensly popular, not only in Information and Communication Technology circles, but also among people in more mundane fields of labour; a tendency that has mushroomed with the advent of mobile communication and the combined growing popularity of Short Message Services.

At present, there are 7389 TLAs in the database. Of these, 4434 are distinct, out of 17576 possible (25.23%).

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TLA's starting with X
25 results

XAA  XFree86 Acceleration Architecture
XBA  Extra Bases Advanced
XCP  eXtended Content Protection
  eXtended Copy Protection
XDF  eXtreme Deep Field
XDR  eXternal Data Representation
XDS  Xerox Data System
XLR  Extra Long Run
XML  eXtensible Markup Language
XNA  XNA’s Not Acronymed
XOA  Xen Orchestra Appliance
XPM  eXplainable Predictive Maintenance
XRK  eXtreem Rete Kut
XRS  X-ray Spectrometer
XSD  XML Schema Definition
  XML Schema Document
XSL  eXtensible Stylesheet Language
XSS  Cross-site scripting
XTC  eXTaCy (3,4-Methylene-Dioxy-Methyl-Amphetamine )
XTP  Express Transfer Protocol
XUL  XML User Interface Language
XWD  X Window Dump
XXL  Extra Extra Large
XXS  Extra Extra Small
XYZ  eXamine Your Zipper