Hmmm... That could be a horizontal bar ( ― ), a 2em dash ( ⸺ ) or a 3em dash ( ⸻ ) all of which I've seen used. All too often, what gets displayed is a notdef character. The actual character will depend on the font, some common examples in the attached graphic. Others may be used depending on what is set for glyph 0 in the font.
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