It means that the current flows in a specific direction.
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If you mean CD plus DC then in Roman numerals they add up to M meaning 400 plus 600 = 1000
Five hundred is shown as a D, so 400 is D minus 100 or C (DC). Ninety is 100 minus 10 (XC), so the answer is CDXC.
600 in Roman numerals = DC
the answer is EE because A is 1 and B is 2 so 12, and D is 4, C is 3. So it ends up as 43 plus 12, which is EE because E is 5 so It would say 55.
DC = 600