X.435 stands for CCITT EDI Protocol
X-REF stands for Cross-Reference
X-MODALL stands for Optimised Exchange Between All Modes of All Conforming Consignments (freight transportation; Pell Frischmann Consultants, Ltd.)
X-MIL stands for Extra Military Expense
X-I stands for Ex-Interest
X-HOUR stands for Time crisis planning sequence is initiated by a Warning Order (precedes N-hour)
X-MZM stands for Cross-Coupled Mach-Zehnder Modulator
X-Gt stands for Xbar Generator
X-MED stands for Xerox Mobile Express Driver
X-OFF stands for Transmitter Off