English abbreviations from xray to xslfo
- X-RAY (0.01 to 10 nanometers (3 × 10^16 Hz to 3 × 10^19 Hz))
- XRC (eXtended Remote Copy)
- XRD (X-Ray Diffraction)
- XRDAL (X- Ray Diffraction Analysis Laboratory)
- XRE (XML Regular Expression)
- XRF ((celestial object) X-Ray Flash)
- XRG (X Resource Graph)
- XRI (eXtensible Resource Identifier)
- XRJ (Xtreme Rumble Junkie)
- XRK-1 (Kinner RK- Experimental Transport Aircraft)
- XRL (X- Ray Lithography)
- XRM (eXtended Relationship Management)
- XRML (eXtensible Rights Markup Language)
- XRQ (Fairchild RQ-2 Experimental Transport Aircraft)
- XRR (Ross River Airport)
- XRS (Extensible Radio Specification)
- XRT (Xtremely Rough Terrain)
- XRY (Jerez Airport (La Parra Airport))
- XS (Xiaolin Showdown)
- XSA (XML Software Autoupdate)
- XSB (Single Barrier Unit map location)
- XSC (South Caicos Airport)
- XSD (Tonopah Test Range Airport (FAA: TNX))
- XSE (Sebba Airport)
- XSF (Xtreme Special Forces)
- XSH (XML Editing Shell)
- XSI (South Indian Lake Airport)
- XSIE (X/Open System Interface Extension)
- XSL (Extensible Stylesheet Language)
- XSL-FO (Extensible Stylesheet Language Formatting Objects)