What does ZD stand for?

What does ZD mean?

ZD	Ziff Davis Business » Firms
ZD	Ziff- Davis, Inc. Business » NYSE Symbols
ZD	Zophar's Domain Internet
ZD	Zero Defects Computing » General
ZD	Zoned Decimal Computing » Assembly
ZD	Zone Description Computing » Databases
ZD	Zap Directory Computing » Assembly
ZD	Zero Dignity Community » Law
ZD	Zemansky And Dittman Business » Firms
ZD	Continental Shelf (Northwest European), Danish sector Regional » Countries
ZD	Zertifikat Deutsch International » German