(Main list of acronyms)
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XA XAF – (s) BEAC (Banque des états de l'Afrique centrale) Central Africa CFA (Coopération financière en Afrique centrale) franc (ISO 4217 currency code) XAG – (s) Silver Troy ounce (ISO 4217 currency code) XAU – (s) Gold Troy ounce (ISO 4217 currency code)
XB XBA – (s) European Composite Unit (EURCO; Bonds market unit) (ISO 4217 currency code) XBB – (s) European Monetary Unit (E.M.U.; Bonds market unit) (ISO 4217 currency code) XBML – (p) eXtended Business Modelling Language
XC XC – (s) Ninety (in Roman numerals) XCBL – (i) XML Common Business Library XCD – (s) East Caribbean dollar (ISO 4217 currency code)
XD XD – Used in chatrooms or email for smiley face. X is the eyes; squinted D is the mouth; XD.
XE Xe – (s) Xenon
XF XF (s) Automobile made by Jaguar (s) Truck made by DAF Trucks (p) IATA code for Vladivostok Air XFA – (i) XML Forms Architecture XFC – (i) Xtreme Fighting Championships XFD – (s) Fighter aircraft made by Douglas Xfe – (i) X File Explorer XFF – (i) X-Forwarded-For XFG – (p) Exfoliation glaucoma XFH (s) 1932 prototype U.S. Navy fighter aircraft made by Hall (i) X-ray fluorescence holography XFN (i) XHTML Friends Network (p) IATA code for Xiangyang Liuji Airport XFR – (s) Automobile made by Jaguar XFT – (p) X FreeType interface library XFW – (p) IATA code for Hamburg Finkenwerder Airport
XG XG – (s) Automobile made by Hyundai XGA – (p) Extended Graphics Array XGE (i) Xoreax Grid Engine (s) Signal for "I Surrender" XGG – (p) IATA code for Gorom Gorom Airport XGN – (p) IATA code for Xangongo Airport XGP – (p) Extreme Game Player XGR – (p) IATA code for Kangiqsualujjuag (Georges River) Airport
XH xh – (s) Xhosa language (ISO 639-1 code) xho – (s) Xhosa language (ISO 639-2 code) XHTML – (p) eXtensible Hypertext Markup Language XHR – (p) eXtra high Image resolution – XMLHTTPRequest
XI XI – (s) Eleven (in Roman numerals) XII – (s) Twelve (in Roman numerals) XIII – (s) Thirteen (in Roman numerals) XIV – (s) Fourteen (in Roman numerals) XIX – (s) Nineteen (in Roman numerals)
XJ XJ (s) Automobile made by Jaguar (s) Automobile made by Jeep XJL (s) Amphibian aircraft made by Columbia (s) Automobile made by Jaguar XJS – (s) Automobile made by Jaguar
XK XK (s) Automobile made by Jaguar (s) Automobile made by Jeep (s) Kell blood group precursor XKA – (p) IATA code for Kantchari Airport XKB – (p) X keyboard extension XKE – (s) Automobile made by Jaguar XKH – (p) IATA code for Xieng Khouang Airport XKR – (s) Automobile made by Jaguar XKS – (p) IATA code for Kasabonika Airport XKY – (p) IATA code for Kaya Airport
XL XL (p) eXtra Large (s) Forty (in Roman numerals)
XM XML – (p) eXtensible Markup Language XMSF – (p) eXtensible Modelling and Simulation Framework
XN XN – (s) Christian – (s) Nordic Patent Institute XNA (p) IATA code for Northwest Arkansas Regional Airport (i) X-No-Archive (i) Xeno Nucleic Acid XNAY - X-No-Archive: yes XNC – (i) X Northern Captain XNN – (p) IATA code for Xining Caojiabao Airport XNS (i) Xerox Network Systems (p) Extensible Name Service (s) Christians XNU – (p) X is Not Unix
XO XO (i) Χριστιανός Ορθόδοξος (Xristianos Orthodoksos, Greek for "Eastern Orthodoxy") (p) eXecutive Officer eXtra Old (brandy grade) XOF – (s) BCÉAO (Banque centrale des états de l'Afrique de l'Ouest) West African CFA (Communauté financière d'Afrique) franc (ISO 4217 currency code)
XP XP – (p) eXperience Point (role-playing games) XPD – (s) Palladium Troy ounce (ISO 4217 currency code) XPF – (s) CFP franc (ISO 4217 currency code) XPT – (s) Platinum Troy ounce (ISO 4217 currency code)
XQ XQJ – (p) XQuery API for Java™ XQP – (p) IATA code for Quepos La Managua Airport XQU – (p) IATA code for Qualicum Beach Airport
XR XRML – (p) eXtensible Rights Markup Language XRP – (s) a cryptocurrency
XS XS – (i) Xiaolin Showdown -(s) Extra Small XSL – (p) eXtensible Style Language
XT XTMH – eXtreme Technology Multiprocessor Hyperlanguage
XU XUL – (p) XML User Interface Language
XV XV – (s) Fifteen (in Roman numerals) XVA – an X-Value Adjustment (in finance) XVI – (s) Sixteen (in Roman numerals) XVII – (s) Seventeen (in Roman numerals) XVIII – (s) Eighteen (in Roman numerals)
XW XWB – (p) (Airbus A350) "Extra Wide Body" XWF – (i) Xcitement Wrestling Federation XWM – (i) X window manager XWN – (p) eXtended WordNet XWS – (i) X Window System
XX XX – (s) Twenty (in Roman numerals) XXX – (s) Hardcore pornography (film rating) – Thirty (in Roman numerals)
XY XYA – (p) IATA code for Yandina Airport Xyl – (s) Xylobium
XZ XZA – (p) IATA code for Zabré Airport XZN – (s) Triple square screw driver