English abbreviations from xpsi to xrml
- XPSI (Xeroderma Pigmentosum Society, Inc.)
- XPT (Platinum Troy ounce (ISO 4217 currency code))
- XPW (Xtreme Pro Wrestling)
- XQ (XQuery)
- XQ2 (Xtreme Quake II)
- XQ3 (Xtreme Quake III)
- XQA (Ex Quizzer's Association)
- XQB (Former QuarterBack)
- XQJ (XQuery API for Java™)
- XQK (Xylophone Quail Killers)
- XQL (XML Query Language)
- XQM (XMail Queue Manager)
- XQM-103 (Teledyne Ryan Experimental AQM-103 Firebee)
- XQP (IATA code for Quepos La Managua Airport)
- XQU (IATA code for Qualicum Beach Airport)
- XQX (XQueryX)
- XR (X-ray Reflectivity)
- 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)