ZDC CTLR EXPRESSED CONCERN REGARDING FLT PLAN FORMATTING AND ARPT IDENTS.

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C500 DEPARTED ILM ARPT. ILMZ HANDED OFF ACFT TO ZDC SECTOR 26. THE RTE OF FLT ON THE URET SHOWED ILM AR21 CRANS FISEL2 FLL; AS DID THE NAS DATABASE. ACFT WAS HEADING S ON AR21; LIKE IT SHOWED ON FLT PLAN. HOWEVER; WHEN A RTE DISPLAY ENTRY WAS MADE ON THE RADAR DISPLAY; IT SHOWED RTE GOING W; TOWARDS FLO FLORENCE; SC. ACFT HANDED OFF TO THE WRONG SECTOR. HERE'S THE PROB; AND IT MAY BE WIDESPREAD: AR21 IS 'ATLANTIC RTE TWO-ONE.' IT IS ALSO THE ARPT IDENTIFIER FOR A HELIPAD IN ARKANSAS. IT APPEARS MIAMI FSS GOOFED; WHEN THEY WERE TYPING IN THE RTE OF FLT. IF YOU USE TWO PADS (A PERIOD) LIKE THIS '..' THAT MEANS TO GO DIRECTLY TO A FIX. IN THIS CASE; ARKANSAS. IF ONE PAD IS USED '.' THAT MEANS TO JOIN AN AIRWAY. IT SHOULD HAVE ONE DOT; NOT TWO. THIS HAS HAPPENED BEFORE. IT ONLY TAKES ONE LITTLE DOT TO MESS UP THE WHOLE FLT PLAN; AND POTENTIALLY CAUSE AN AIRSPACE VIOLATION OR AN OPERROR. I SUGGEST THAT A THOROUGH REVIEW OF ALL AR RTES BE CONDUCTED AND COMPARED TO ANY ARPT IDENTIFIERS. ONCE THE DUPLICATES ARE FOUND; ONE OF THEM NEEDS TO BE CHANGED.