| WSCI | Web Services Choreography Interface | In English | → Networks, communication |
| WSCL | Web Services Conversation Language | In English | → Programming languages → Networks, communication |
| WSDL | Web Services Description Language | In English | → Networks, communication → Telecommunications |
| WSDL | Web Service Description Language | In English | → Software → Networks, communication |
| WSFL | Web Services Flow Language | In English | → Programming languages → Networks, communication |
| WTLS | Wireless Transport Layer Security | In English | → Networks, communication → Telecommunications |
| WUD | World Usability Day | In English | → Human-computer interaction |
| WURFL | Wireless Universal Resource File | In English | → Computer science → Telecommunications |
| WWW | World Wide Web = TTT | Tut-Tera Teksaĵo | In Esperanto |
In English | → Internet |
| WYSIWYG | What You See Is What You Get | In English | → Computer-based techniques |
| XAML | EXtensible Application Markup Language | In English | → Programming languages → Human-computer interaction |
| XBEL | XML Bookmark Exchange Language | In English | → Programming languages → Networks, communication → Libraries |
| XBL | EXtensible Bindings Language | In English | → Programming languages |
| XBL | XML Binding Language | In English | → Computer science |
| XBL | XML (Extensible Markup Language) Binding Language | In English | → Programming languages → Data |
| XBRL | EXtensible Business Reporting Language | In English | → Programming languages → Economics |
| XCF | EXperimental Computing Facility | In English | → Computer science |
| XDM | XPath Data Model | In English | → Data → Networks, communication |
| XEP | XMPP Extension Proposal | In English | → Networks, communication → Telecommunications |
| XFDL | Extensible Forms Description Language | In English | → Programming languages → Human-computer interaction |
| XFN | XHTML (EXtensible HyperText Markup Language) Friends Network | In English | → Programming languages → Data → Networks, communication" |
| XHTML | EXtensible HyperText Markup Language | In English | → Programming languages → Data |
| XHTML-MP | Extensible Hypertext Markup Language - Mobile Profile | In English | → Networks, communication → Telecommunications |
| XINS | XML Interface for Network Services | In English | → Networks, communication |
| XMDS | eXtensible Multi-Dimensional Simulator | In English | → Computer simulation → Mathematics |
| XML | EXtensible Markup Language | In English | → Programming languages → Data |
| XMPP | EXtensible Messaging and Presence Protocol | In English | → Networks, communication |
| XNCL | XML Namespace Catalogue Language | In English | → Programming languages → Data |
| XNP | eXtreme Non Programming | In English | → Software |
| XOPA | Xerox Office Productivity Advisor | In English | → Computer science |
| XPath | XML Path Language | In English | → Programming languages → Data |
| XPCOM | Cross Platform Component Object Model | In English | → Software → Operating systems |
| XPDL | XML Process Definition Language | In English | → Management → Programming languages |
| XPFE | Cross Platform Front End | In English | → Software → Operating systems |
| XPS | XML Paper Specification | In English | → Data → Document processing |
| XSL | Extensible Style Language | In English | → Document processing |
| XSL | EXtensible Stylesheet Language | In English | → Programming languages → Document processing |
| XSL-FO | XSL (EXtensible Stylesheet Language) Formatting Objects | In English | → Programming languages → Graphical processing |
| XSL-FO | EXtensible Stylesheet Language Formatting Object | In English | → Programming languages → Document processing |
| XSLT | EXtensible Stylesheet Language Transformations | In English | → Programming languages → Document processing |
| XSS | Cross-Site Scripting Attack | In English | → Networks, communication |
| XUL | XML-based User interface Language | In English | → Programming languages → Human-computer interaction |
| XWMS | XML Workflow Management Server | In English | → Computer science |
| ZBW | Zentrum für Bildwissenschaften | In German | → Image processing |
| ZGDV | Zentrum für Graphische Datenverarbeitung | In German | → Data → Computer-based techniques |
| ZID | Zentraler Informatikdienst | In German | → Computer science |
| ZJK | Zentrum für Jüdische Kulturgeschichte | In German | → Judaism → Language, linguistics, literature → Geography, biography, history → Civilization, culture, progress |
| ZSMP | Zavod za Standardizaciju, Mjeriteljstvo i Patente | In Bosnian | → Standardization → Industrial property |
| ΓΣΠ | Γεωγραφικά Συστήματα Πληροφοριών = GIS | Geographic(al) Information System | In English = SIG | Sistema Informativo Geografico | In Italian = SIG | Sistema de Información Geográfica | In Spanish = SIG | Sistema d'informació geogràfica | In Catalan = GIS | Geografický Informační Systém | In Czech = ГИС | Географска информационна система | In Bulgarian = GIS | Geographisches Informationssystem | In German = GIS | Geoinformationssystem | In German = GIS | Geoinfosüsteem | In Estonian = GIS | Geografski informacijski sustav | In Croatian = ממ"ג | מערכת מידע גאוגרפית | In Hebrew = GIS | Geografinė informacinė sistema | In Lithuanian = SIG | Sistem Informasi Geografis | In Indonesian = GIS | Geografisch Informatiesysteem | In Dutch = GIS | Geografiske informasjonssystem | In Nynorsk = GIS | Geografiske informasjonssystemer | In Norwegian = SIG | Sistema de informação geográfica | In Portuguese = ГИС | Географическая Информационная Система | In Russian = GIS | Geografski informacijski sistem | In Slovenian = GIS | Geografiskt InformationsSystem | In Swedish = ГІС | Геоінформаційна система | In Ukrainian |
In Greek | → Software → Geography |
| ΔΦΑ | Διεθνές Φωνητικό Αλφάβητο = AFI | Alfabetul Fonetic Internaţional | In Romanian = LFE | Lizherenneg Fonetikel Etrebroadel | In Breton = МФА | Международната фонетична азбука | In Bulgarian = IPA | Internationales Phonetisches Alphabet | In Tosk = AFI | Alfabet fonètic internacional | In Catalan = IFA | Internacia Fonetika Alfabeto | In Esperanto = IPA | International Phonetic Alphabet | In English = IPA | Internationales Phonetisches Alphabet | In German = API | Alphabet Phonétique International | In French = AFI | Alfabeto Fonético Internacional | In Spanish = AFI | Alfabeto Fonético Internacional | In Galician = NAF | Nazioarteko Alfabeto Fonetikoa | In Basque = IPA | Internationalt Phonetescht Alphabet | In Letzeburgesh = AFI | Alfabeto Fonetico Internazionale | In Italian = МФА | Международный фонетический алфавит | In Russian = AFI | Alfabeto Fonético Internacional | In Portuguese = AFI | Alfabet fonetic internacionau | In Occitan = AFE | Alfabet Fonetike Eternåcionå | In Walloon = IFA | Internationoal Fonetisch Alfabet | In Vlaams = AFN | Alfabeti Fonetik Ndërkombëtar | In Albanian |
In Greek | → Writing systems |
| АБИС | Автоматизированные библиотечные информационные системы = SIGB | Système Intégré de Gestion de Bibliothèque | In French = ILS | Integrated Library System | In English |
In Russian | → Knowledge management → Libraries → Software |
| ГІС | Геоінформаційна система = ΓΣΠ, GIS, SIG, ГИС, ממ"ג (look above) |
In Ukrainian | → Software → Geography |
| ГИС | Географическая Информационная Система = ΓΣΠ, GIS, SIG, ממ"ג, ГІС (look above) |
In Russian | → Software → Geography |
| ГИС | Географска информационна система = ΓΣΠ, GIS, SIG, ממ"ג, ГІС (look above) |
In Bulgarian | → Software → Geography |
| МФА | Международната фонетична азбука = ΔΦΑ, AFI, LFE, IPA, IFA, API, NAF, AFE, AFN (look above) |
In Bulgarian | → Writing systems |
| МФА | Международный фонетический алфавит = ΔΦΑ, AFI, LFE, IPA, IFA, API, NAF, AFE, AFN (look above) |
In Russian | → Writing systems |
| ממ"ג | מערכת מידע גאוגרפית = ΓΣΠ, GIS, SIG, ГИС, ממ"ג, ГІС (look above) |
In Hebrew | → Software → Geography |
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