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The dashes on either side of the Datum symbol are from the 1994 revision. Current practice is to use the supplied Datum symbol identifier with the filled or non-filled traingle on the bottom. Using the Datum symbol inside Inventors FCF pick box is not an acceptable ASME practice and should be avoided. As far as using a Datum Feature symbol, we place ours on top or on the bottom of the FCF, or directly on the part itself. It would be nice to be able to add it to the dimension but I believe this is also not an acceptable ASME practice.