What does X-HOUR stand for?

Time crisis planning sequence is initiated by a Warning Order (precedes N-hour)

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Microsoft console game system Extraterrestrial Combat Unit (game) Experimental-Crew Return Vehicle (X-38 International Space Station Lifeboat; aka CRV, XCRV, X-38) Ex-Dividend Ex-Dividend X-Entertainment (website) eXperimental û Fire Integration Support Team Cross-correlation Frequency Resolved Optical Gating eXempt from the General Declassification Schedule Xbar Generator		Ex-Interest Ex-Interest Ex-Interest XML Key Information Service Specification XML Key Registration Service Specification (W3C) Christmas Xerox Mobile Express Driver Extra Military Expense Optimised Exchange Between All Modes of All Conforming Consignments (freight transportation; Pell Frischmann Consultants, Ltd.) Cross-Coupled Mach-Zehnder Modulator