Acronyms, Abbreviations, and Initialisms
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X
X Window System
X.25
Packet Switching Services Protocol
X.400
ITU Message Handling Services protocol
X.500
ITU Directory Services protocol
X.509
ITU standard for certificate that binds an entity's name to its public key using a digital signature
X3
ANSI Computers and Information Processing Committee
X3H2
Ansi Database Committee
XAPIA
X.400 Application Programming Interface Association
XB
X-Band
XBSS
X/Open Baseline Security Services
XDR
eXternal Data Representation
XDS
X/Open Directory Server
XHTML
Extensible HyperText Markup Language
XICS
Xerox Integrated Composition System
XML
Extensible Markup Language
XO
Executive Officer
XOM
X/Open Object Management
XP
extreme programming
XPG
X/Open Portability Guide
XPG
X/Open's X Portability Guide
XSD
XML Schema Definition
XSITE
Combat System Integrated Trainer Equipment
XSL
Extensible Stylesheet Language
XTI
X/Open transport interface
XTIS
Extended Tool Integration Services
XTP
eXpress Transfer Protocol
XWM
X window manager
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