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It depends on who is using it and where. Here are some possibilities:

* Designated Driver \

* Designation used for a destroyer in the US Navy - i.e. USS John Rodgers (DD-963)

* DD - Department of Defense - often used when referring to forms, such as "Your DD-214 is an important document, don't lose it!"

* Stock Market symbol for E.I. du Pont de Nemours & Company

* Dunkin Donuts - "I'm going for some dd, want some?"

* dd - A UNIX programming language

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14y ago

What else can I help you with?