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.