D-

D- means:

• Placed before a U.S. state, usually in parentheses, indicates the person it applies to is a Democratic Party politician of that state. "R-" is used for the Republican Party.
• An academic grade given by certain institutions. Slightly better than an F and slightly worse than a D. See Grading in education.
• A prefix signifying chirality of a molecule

• Rep.
• Sen.

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