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Abkürzung-Kategorie: x
| Abkürzung | Langform |
| XSSI | Extended Server Side Includes |
| XSTX | Transparent Start of Text |
| XSYN | Transparent Synchronous Idle |
| XT | Extended Technology |
| XT | Crosstalk |
| XTAL | Crystal |
| XTCLK | External Transmit Clock |
| XTI | X/Open Transport (Layer) Interface |
| xtk | Parameter-Steuerfile (X-Talk) |
| xtp | Programmoverlay (XTree Pro) |
| XTP | XPress Transfer Protocol |
| XTTD | Transparent Temporary Text Delay |
| XUI | X11 User Interface |
| XUL | Extensible/XML-Based User Interface Language |
| XUMA | Expertensystem Umweltgefährlichkeit von Altlasten |
| XVE | X11 Visual Extensions |
| XVI | XTendbus VMEbus Interface |
| XVS | X/Open System V Specification |
| XVT | Extensible Virtual Toolkit |
| XWD | X11 Window Dump |
| xwd | X - Window - Dump |
| XWS | X Window System, X11 |