(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
  • 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