| Acronyms | Meaning / Significance | Source |
X-Series | CCITT data
communication network | | X-TELL | cross tell | | XI | exercise
indicator | | XID | exchange
identification | | XMIT | transmit | | XMITR | transmitter | | XML | eXtensible Markup Language | World Wide
Web Consortium (W3C) | XML | exercise manning
list | | XMSN | transmission | | XMT | exempt | | XOR | logical operator | | XSERV | aircraft x-servicing ample gain programme subsystem | | XTAL | crystal | |
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