List of acronyms: X

This list contains acronyms, initialisms, and pseudo-blends  that begin with the letter X.

For the purposes of this list:

• acronym = an abbreviation pronounced as if it were a word, e.g., SARS = severe acute respiratory syndrome, pronounced to rhyme with cars
• initialism = an abbreviation pronounced wholly or partly using the names of its constituent letters, e.g., CD = compact disc, pronounced cee dee
• pseudo-blend = an abbreviation whose extra or omitted letters mean that it cannot stand as a true acronym, initialism, or portmanteau (a word formed by combining two or more words).

(a) = acronym, e.g.: SARS – (a) severe acute respiratory syndrome

(i) = initialism, e.g.: CD – (i) compact disc

(p) = pseudo-blend, e.g.: UNIFEM – (p) United Nations Development Fund for Women

(s) = symbol (none of the above, representing and pronounced as something else; for example: MHz – megahertz)

Some terms are spoken as either acronym or initialism, e.g., VoIP, pronounced both as voyp and V-O-I-P.

(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)

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