It indicates where the "cursor" is: that is where the next character will appear.
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Bj
insertion point
text my line
Probably the best way is to go in and draw a line where you want it. You can then group the text box with the line so if you move the box, the line will move with it. If you edit the text, though, the line will not move with your 'over-bar' text.
a line through a section of text