List of acronyms: X

XA

• XAF – BEAC Central Africa CFA franc
• XAG – Silver Troy ounce
• XAU – Gold Troy ounce

XB

• XBA – European Composite Unit
• XBB – European Monetary Unit
• XBML – eXtended Business Modelling Language

XC

• XC – Ninety
• XCBL – XML Common Business Library
• XCD – East Caribbean dollar

XD

• XD – Used in chatrooms or email for smiley face. X is the eyes; squinted D is the mouth; XD.

XE

• Xe – Xenon

XF

• XF
• * Automobile made by Jaguar
• * Truck made by DAF Trucks
• * IATA code for Vladivostok Air
• XFA – XML Forms Architecture
• XFC – Xtreme Fighting Championships
• XFD – Fighter aircraft made by Douglas
• Xfe – X File Explorer
• XFF – X-Forwarded-For
• XFG – Exfoliation glaucoma
• XFH
• * 1932 prototype U.S. Navy fighter aircraft made by Hall
• * X-ray fluorescence holography
• XFN
• * XHTML Friends Network
• * IATA code for Xiangyang Liuji Airport
• XFR – Automobile made by Jaguar
• XFT – X FreeType interface library
• XFW – IATA code for Hamburg Finkenwerder Airport

XG

• XG – Automobile made by Hyundai
• XGA – Extended Graphics Array
• XGE
• * Xoreax Grid Engine
• * Signal for "I Surrender"
• XGG – IATA code for Gorom Gorom Airport
• XGN – IATA code for Xangongo Airport
• XGP – Extreme Game Player
• XGR – IATA code for Kangiqsualujjuag (Georges River) Airport

XH

• xh – Xhosa language
• xho – Xhosa language
• XHTML – eXtensible Hypertext Markup Language
• XHR – eXtra high Image resolution – XMLHTTPRequest

XI

• XI – Eleven
• XII – Twelve
• XIII – Thirteen
• XIV – Fourteen
• XIX – Nineteen

XJ

• XJ
• * Automobile made by Jaguar
• * Automobile made by Jeep
• XJL
• * Amphibian aircraft made by Columbia
• * Automobile made by Jaguar
• XJS – Automobile made by Jaguar

XK

• XK
• * Automobile made by Jaguar
• * Automobile made by Jeep
• * Kell blood group precursor
• XKA – IATA code for Kantchari Airport
• XKB – X keyboard extension
• XKE – Automobile made by Jaguar
• XKH – IATA code for Xieng Khouang Airport
• XKR – Automobile made by Jaguar
• XKS – IATA code for Kasabonika Airport
• XKY – IATA code for Kaya Airport

XL

• XL
• * eXtra Large
• * Forty

XM

• XML – eXtensible Markup Language
• XMSF – eXtensible Modelling and Simulation Framework

XN

• XN – Christian – Nordic Patent Institute
• XNA
• * IATA code for Northwest Arkansas Regional Airport
• * X-No-Archive
• * Xeno Nucleic Acid
• XNC – X Northern Captain
• XNN – IATA code for Xining Caojiabao Airport
• XNS
• * Xerox Network Systems
• * Extensible Name Service
• * Christians
• XNU – X is Not Unix

XO

• XO
• * Χριστιανός Ορθόδοξος
• * eXecutive Officer
• *eXtra Old
• XOF – BCÉAO West African CFA franc

XP

• XP – eXperience Point
• XPD – Palladium Troy ounce
• XPF – CFP franc
• XPT – Platinum Troy ounce

XQ

• XQJ – XQuery API for Java™
• XQP – IATA code for Quepos La Managua Airport
• XQU – IATA code for Qualicum Beach Airport

XR

• XRML – eXtensible Rights Markup Language
• XRP – a cryptocurrency

XS

• XS – Xiaolin Showdown - Extra Small
• XSL – eXtensible Style Language

XT

• XTMH – eXtreme Technology Multiprocessor Hyperlanguage

XU

• XUL – XML User Interface Language

XV

• XV – Fifteen
• XVA – an X-Value Adjustment
• XVI – Sixteen
• XVII – Seventeen
• XVIII – Eighteen

XW

• XWB – "Extra Wide Body"
• XWF – Xcitement Wrestling Federation
• XWM – X window manager
• XWN – eXtended WordNet
• XWS – X Window System

XX

• XX – Twenty
• XXX – Hardcore pornography – Thirty

XY

• XYA – IATA code for Yandina Airport
• Xyl – Xylobium

XZ

• XZA – IATA code for Zabré Airport
• XZN – Triple square screw driver