STRING is the default argument used after the FORMAT keyword in a Display command. Use of STRING causes the contents of the dictionary entry to appear on the screen exactly the way it was typed.
Example
SYMBOL "Relation" IN "Shlaer Information Model" { PROPERTY "Description" { EDIT Text LENGTH 100 } PROPERTY "Reverse Phrase" { EDIT Text LENGTH 65 DISPLAY { FORMAT STRING LEGEND "$$NONE$$" } } ...}