What does DX stand for?

What does DX mean?

DX	Distance Reception Academic & Science » Amateur Radio
DX	Declare X Computing » Assembly
DX	Deep Donor in III-V compounds Academic & Science » Electronics
DX	Diagnosis Governmental » FDA
DX	THOR database Cross-reference data Computing » File Extensions
DX	Data explorer Document file Computing » File Extensions
DX	DEC WPS/DX format Text file Computing » File Extensions
DX	Degeneration X Miscellaneous » Funnies
DX	Dat's Xpensive Miscellaneous » Funnies
DX	Dragon eXtreme Miscellaneous » Gaming
DX	Direct X Computing » General
DX	Digital Xchange Computing » Hardware
DX	Discharged Medical » Hospitals
Dx	Diagnosis Medical » Hospitals
dX	the Derivative of X Academic & Science » Mathematics
DX	Direct Exchange Governmental » Military
DX	Directorate for External Relations (DIA) Governmental » Military
DX	Dana Xenophon Miscellaneous » Names and Nicknames
DX	Dynex Capital, Inc. Business » NYSE Symbols
DX	Diagnosis Medical » Oncology
DX	Diagnosis Medical » Physiology
DX	Disease Medical » Physiology
DX	Duplex Computing » Telecom
DX	Delta X Governmental » Transportation
DX	Distance X Miscellaneous » Unclassified