List of acronyms: X

(Main list of acronyms)

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)
 * 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