Characters in Design Table Don't Display in Drawing

My client insists on uses an up-pointing solid arrow to indicate that a dimension on a part is for inspection reference.  So, in the heading row of my design table, I've got to get one of these triangles to appear next to a dimension name.  No problem in the Excel spreadsheet - i simply insert Unicode symbol 25B2 and this displays properly on the screen.  When I insert the design table into a drawing, however, the symbol does not appear.  How can I correct this?

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