Hi. I don't believe this is actually a circle with a plus sign. I have attached a small .doc with the suggestion of using a circle with interior modification (horizontal bar and superposed vertical bar). Be sure whatever you use that you include in a tn or on the special symbols page the description of the print symbol. I based my suggestion on a symbol that is present in the Nemeth Code -- a square with interior diagonals-- which you can see on page 112 of the code book.
If anyone knows of a symbol that has already been created to represent this print sign, please advise.