ZD
Zd or ZD may refer to:
Nissan ZD engine, an automobile engine
Zero Defects, a management program to eliminate defects in industrial production, popular in American industry in the late 1960s
Zero-defects mentality, in which a command-and-control structure does not tolerate mistakes
Zertifikat Deutsch, a certificate of German language ability
Ziff Davis, a magazine publisher and Internet information provider
Zooey Deschanel, an American actress and musician
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